JP2007267335A - Server device, client device, server client system, and program - Google Patents

Abstract

A client device having mobility by reducing a data amount of communication between a server device and a client device and reducing a processing load of the client device when a remaining battery level of the client device is reduced. To reduce power consumption.
The battery level of the client device is transmitted to the server device, the server device is processed so as to reduce the amount of content data based on the remaining battery level, and the reduced content data is transmitted to the client device. As a result, the client device whose battery level has decreased reduces the content reproduction load.
[Selection] Figure 6

Description

  The present invention relates to a server client system that reproduces content data transmitted from a server device based on a request from the client device on the client device, and in particular, according to the remaining battery level of the client device having mobility that is driven by a battery. The present invention relates to a server client system including a client device that adjusts the amount of content data to be transmitted to a server device.

  2. Description of the Related Art Conventionally, there is a server client system including a client device having content such as a moving image, a still image, and audio, and a server device that requests the client device to distribute the content and reproduces the transmitted content. Exists.

In such a server client system, when the client device sets and transmits a variable playback request to the content request to the server device, the server device generates and transmits variable playback content data to the client device. Some content can be played back at a variable speed only by executing the same processing as that for normal content playback on the received variable speed playback content data from the server device (see, for example, Patent Document 1).
JP 2004-350043 A

  However, in the server client system as described above, in order to reduce the processing load on the client device, when requesting content from the client device to the server device side, a request set to reduce the load must be made. In other words, there is a problem that the battery level on the client device side is not taken into consideration.

  Therefore, the present invention has been made in view of the above problems, and has been transmitted to a client device having content such as a moving image, a still image, and audio, and to request the client device to distribute the content. In a server client system composed of a server device that plays back content, when the battery level of the client device is low, the amount of communication data between the server device and the client device is reduced and the processing of the client device It is an object of the present invention to provide a server device, a client device, a server client system, and a program that can reduce the load and reduce the power consumption of the client device having mobility.

The present invention employs the following configuration in order to solve the above problems.
That is, according to one aspect of the present invention, the client device of the present invention is a client device that reproduces content data transmitted from a server device, and transmits the content data to the server device. Content request transmitting means for transmitting requested request information, content receiving means for receiving the content data transmitted from the server device, battery capacity measuring means for measuring the capacity of a battery for driving the client device, A battery capacity transmitting means for transmitting battery capacity information indicating the capacity of the battery measured by the battery capacity measuring means to the server device; and a data format for determining a data format of content data received by the content receiving means By the judging means and the data format judging means According sectional data format, characterized in that it comprises a content reproducing means for reproducing the content data received by the content receiving unit.

In the client device of the present invention, it is preferable that the battery capacity transmission unit transmits the battery capacity information when an event occurs in the client device.
According to another aspect of the present invention, the server device of the present invention is a server device that transmits content data to the client device in accordance with a request from the client device, and the content transmitted from the client device. Content request receiving means for receiving request information for requesting data to be transmitted to the client device, and battery capacity information indicating the capacity of the battery for driving the client device transmitted from the client device Battery capacity receiving means, content processing means for processing the content to create processed content based on the battery capacity information received by the battery capacity receiving means, and battery capacity information received by the battery capacity receiving means The processed content based on the client Characterized in that it comprises a content transmission unit for transmitting to the cement system.

  In the server device of the present invention, it is preferable that the content processing unit thins out the frames constituting the moving image and processes the thinned moving image when the content is a moving image.

  In the server device of the present invention, it is preferable that the content processing unit processes the color image into a black and white image when the content is a color image.

  In the server device according to the present invention, it is preferable that the content processing unit processes the high-quality image into a low-quality image when the content is a high-quality image.

In the server device according to the present invention, it is preferable that the content processing unit compresses the content and processes it into a compressed content.
According to another aspect of the present invention, the program of the present invention requests a computer of a client device that reproduces content data transmitted from a server device to transmit the content data to the server device. Content request transmitting means for transmitting request information to be received, content receiving means for receiving the content data transmitted from the server apparatus, battery capacity measuring means for measuring the capacity of a battery for driving the client apparatus, and the battery capacity Battery capacity transmitting means for transmitting battery capacity information indicating the battery capacity measured by the measuring means to the server device, data format determining means for determining the data format of the content data received by the content receiving means, and the data The data judged by the format judgment means According to another form, a program for functioning as a content reproducing means for reproducing the content data received by the content receiving unit.

  Further, according to one aspect of the present invention, the program of the present invention is the content data transmitted from the client device to the computer of the server device that transmits the content data to the client device in accordance with a request from the client device. Content request receiving means for receiving request information for requesting transmission to the client device, a battery for receiving battery capacity information transmitted from the client device and indicating a capacity of a battery for driving the client device Based on battery capacity information received by the battery capacity receiving means, content processing means for processing the content and creating processed content based on the battery capacity information received by the battery capacity receiving means, based on the battery capacity information received by the battery capacity receiving means, The processed content is transferred to the client It is a program for causing to content transmission means for transmitting to the cement system.

  According to the present invention, in a server client system composed of a battery-driven client device and a server device, the remaining battery level information indicating the remaining battery level of the client device is transmitted to the server device, and the server device that has received the battery information It is possible to switch the type of content data to be transmitted in accordance with the remaining battery level information according to the remaining battery level.

  In addition, according to the present invention, when the battery level of the client device is low, the power consumption of the client device can be reduced by converting the content data so that the processing on the client device is reduced and transmitting the content data. Can do.

  Furthermore, according to the present invention, content data with a low processing load is transmitted to a client device with a small remaining battery capacity, so that the drive time of the client device can be extended.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an outline of a network configuration of the server client system 1.
In FIG. 1, the server apparatus 101 has content data in various data formats such as moving image data, still image data, audio data, text data, and the like.

  The client terminal device 102 is connected to the server device 101 via the network 109. The wireless access point 103 is also connected to the server apparatus 101 via the network 109. In addition, mobile terminal devices such as the mobile terminal device 104 and the smartphone 105 are connected to the server device 101 via the network 9 by performing wireless communication with the access point 103. In the following description, the client terminal device 102, the mobile terminal device 104, and the smartphone 105 are collectively referred to as a client device.

  The client terminal device 102, the mobile terminal device 104, or the smartphone 105 constructs the server client system 1 with the server device 101.

  A mobile client device such as the mobile terminal device 104 or the smartphone 105 is driven by a battery such as a detachable secondary battery, and is connected to the server device 101 via a wireless network (for example, WiFi) and the access point 103. As a result, the server client system 1 is configured. In such a server client system 1, the server device 101 transmits content data to the client device in accordance with a request from the client device, and the client device that receives the content data receives the received moving image data, still image data, Content data such as audio data and text data is reproduced.

FIG. 2 is a diagram showing a processing sequence of the present invention.
First, in step S21, when a battery-driven client device, for example, the mobile terminal device 104 transmits a terminal service connection request to the server device 101, the server device 101 that has received the request starts a terminal service in step S22. The mobile terminal device 104 is requested to input identification information (ID) and a password for authentication.

  Thereafter, in step S23, the mobile terminal device 104 inputs the identification information and password, and transmits them to the server device 101. In step S24, the server device 101 that has received these identification information and password executes an authentication process. If the authentication of the mobile terminal device 104 is OK, the server device 101 requests terminal information from the mobile terminal device 104 after confirming the disconnection process in step S25.

  Then, in step S <b> 26, the mobile terminal device 104 transmits the current battery capacity (remaining battery capacity) to the server device 101 together with the generated terminal information such as the screen display size.

  In step S27, the server apparatus 101 generates a display number based on terminal information such as the received screen display size. Furthermore, display data that can be displayed on the mobile terminal device 104 side is generated based on the received battery capacity. In other words, application data is acquired, and display data is generated after image processing is performed on the moving image data, still image data, character data, and the like acquired from the application information according to the capacity of the battery, and the display data is transmitted to the mobile terminal device 104. .

  In step S28, the mobile terminal device 104 that has received the message receives and displays the display data transmitted from the server device 101. When the next event is input, the capacity of the battery at that time is stored in the server together with the event information. Send to device 101.

  Then, in step S29, the server apparatus 101 that has received these battery capacities and event information obtains application information and uses the moving image data, still image data, character data, and the like obtained from the application information in accordance with the battery capacities. Display data after image processing is generated and transmitted to the mobile terminal device 104.

  Thereafter, the mobile terminal device 104 transmits the battery capacity to the server device 101 for each event transmission (step S30), and the server device 101 creates display data based on the battery capacity and transmits the display data to the mobile terminal device 104. (Step S31).

  As described above, the server device 101 converts the display data into the display data that reduces the processing on the mobile terminal device 104 side, and transmits the display data, so that the display quality is lower than when the remaining battery level is sufficient. However, since the memory access amount related to the communication processing and the CPU processing and memory access amount related to the display processing are reduced, the power consumption is reduced.

FIG. 3 is a diagram showing an outline of the configuration of the server apparatus 101.
In FIG. 3, the server device 101 includes a CPU (Central Processing Unit) 301, a program for executing processing executed in the server device 101, and a control program for controlling and executing each function of the server device 101. A memory 302 such as a ROM or a RAM in which data is stored, an input unit 303 for inputting various data and signals, a display unit 304 for displaying images and other information, and recording various information including images. Connected to a network control unit 306 for controlling a content database 308 storing content data in various data formats such as a storage unit 305, moving image data, still image data, audio data, and text data, and a network 109 such as a LAN. Network connection unit 307, mobile terminal device 104, etc. A content processing unit 309 that processes content data stored in the content database 308 based on the remaining battery level transmitted from such a battery-driven client device is connected to the bus 300, and the CPU 301 is configured by each of these units. Is controlling.

  The server apparatus 101 having such hardware has a content request receiving unit, a battery capacity receiving unit, a content processing unit, and a content transmitting unit as functions for realizing the present invention.

  The content request receiving unit is a request transmitted from a client device, for example, the mobile terminal device 104, and has various data formats such as moving image data, still image data, audio data, and text data stored in the content database 308. Request information for requesting transmission of the content data to the mobile terminal device 104 is received. In addition, the battery capacity receiving unit receives battery capacity information indicating the capacity of a battery such as a secondary battery 410 (see FIG. 4) transmitted from the mobile terminal apparatus 104 for driving the mobile terminal apparatus 104. To do.

  Then, the content processing unit processes the content based on the battery capacity information received by the battery capacity receiving unit to create a processed content. The content processing means that when the content is a moving image, the frame constituting the moving image is thinned to be processed into a thinned moving image, for example, a moving image of 30 frames / second is thinned to a moving image of 10 frames / second. Or processing into a still image, or ultimately deleting (meaning an image having no data). In addition, when the content is a color image, the color image is processed into a black and white image, and when the content is a high quality image, the high quality image is processed into a low quality image, or the content is compressed and compressed. It also includes processing into content.

In addition, the content transmission unit transmits the processed content to the mobile terminal device 104 based on the battery capacity information received by the battery capacity reception unit.
FIG. 4 is a diagram illustrating a schematic configuration of the mobile terminal device 104 which is an example of a battery-driven client device.

  In FIG. 4, the mobile terminal device 104 controls and executes each function of the mobile terminal device 104 in addition to a CPU (Central Processing Unit) 401, a program that executes processing executed in the mobile terminal device 104. A memory 402 such as a ROM or RAM in which the control program is stored, an input unit 403 for inputting various data and signals, a display unit 404 for displaying images and other information, and various information including images A storage unit 405 for recording, a recording medium driving unit 406 for driving an external recording medium 408, a network connection unit 407 for connecting to a network 109 such as a LAN, and a secondary battery 410 for driving the mobile terminal device 104. Is connected to the bus 400 to control the power supply and measure the capacity of the power supply control unit 409. 401 is controlling these units.

  The mobile terminal device 104 having such hardware includes a content request transmission unit, a content reception unit, a battery capacity measurement unit, a battery capacity transmission unit, a data format determination unit, and a content reproduction unit as functions for realizing the present invention. And have.

  The content request transmission unit transmits content data in various data formats such as moving image data, still image data, audio data, text data, and the like that the server apparatus 101 has in the content database 308 to the mobile terminal device 104. Request information to be transmitted to the server apparatus 101. In addition, the battery capacity measurement unit measures the capacity of the secondary battery 410 for driving the mobile terminal device 104.

  The battery capacity transmitting unit transmits battery capacity information indicating the capacity of the battery measured by the battery capacity measuring unit to the server device. For example, when an event occurs in the mobile terminal device 104, the battery capacity information is transmitted in synchronization with the information related to the event. However, only the battery capacity information is transmitted periodically (fixed time) apart from the transmission of the information related to the event. (Every interval) or when the battery capacity changes apart from the transmission of information about the event, for example, the remaining battery capacity has been reduced from one-half to one-third or one-fourth You may make it transmit at the time.

  The content receiving unit receives the content data transmitted from the mobile terminal device 104, and the data format determining unit determines the data format of the content data received by the content receiving unit.

  The content reproduction unit reproduces the content data received by the content reception unit in accordance with the data format determined by the data format determination unit. For example, if the data format is moving image data, the moving image data is reproduced, and if the data format is still image data, the still image data is reproduced.

  Since the server apparatus 101 and the mobile terminal apparatus 104 have such functions, the server apparatus 101 consumes the secondary battery 410 by reducing the memory access amount related to the communication processing and the memory access amount related to the display processing. Can be reduced.

Next, the flow of processing executed in the server apparatus 101 and the mobile terminal apparatus 104 will be described using a flowchart.
FIG. 5 is a flowchart showing a flow of processing executed in the mobile terminal device 104, and FIG. 6 is a flowchart showing a flow of processing executed in the server device 101.

  First, in step S51 of FIG. 5, the mobile terminal device 104 determines whether any event has occurred due to a key operation, a touch panel operation, or the like. If it is determined that an event has occurred (step S51: Yes), In step S52, the battery capacity is measured. Here, the capacity of the battery is the current capacity of the secondary battery 410 for driving the mobile terminal device 104, that is, the remaining capacity, for example, the ratio to the fully charged state, 1/2 (1/2) One third, one quarter, one fifth, etc. can be used.

  Next, in step S53, the remaining battery level measured in step S52 and the data related to the event determined to have occurred in step S51 are transmitted to the server device 101 together with information related to the mobile terminal device 104.

  Then, in step S61 in FIG. 6, the server apparatus 101 determines whether or not the data related to the event transmitted from the mobile terminal apparatus 104 together with the information indicating the remaining battery level is received, and in step S62, the event is determined. The generated information related to the mobile terminal device 104 is confirmed and notified to the running application.

  In step S63, it is determined whether or not the content to be reproduced (for example, the image to be displayed) has been rewritten by the event received in step S61. If rewriting has not been performed (step S63: No), this processing is terminated. If rewriting has been performed (step S63: Yes), each content (display data) constituting the image to be rewritten is displayed in step S64. get.

  Next, in step S65, it is determined whether or not the remaining battery level received in step S61 is 1/5 or less. If it is 1/5 or less (step S65: Yes), in step S66, As shown in FIG. 7, the content that is a moving image and the content that is a still image are deleted, leaving only text data. On the other hand, if it is not less than one fifth (step S65: No), the process proceeds to step S67.

  Next, in step S67, it is determined whether or not the remaining battery level received in step S61 is ¼ or less (step S67: Yes). As shown in FIG. 7, the content that is a moving image is deleted, and the content that is a still image is reduced to two colors (monochrome). On the other hand, if not less than a quarter (step S67: No), the process proceeds to step S69.

  Next, in step S69, it is determined whether or not the remaining amount of the battery received in step S61 is one third or less. If it is one third or less (step S69: Yes), in step S70, As shown in FIG. 7, the content that is a moving image is deleted, and the content that is a still image is reduced to 256 colors (8 bpp: Bits Per Pixel). On the other hand, if not less than a quarter (step S67: No), the process proceeds to step S71.

  Next, in step S71, it is determined whether or not the remaining amount of the battery received in step S61 is less than or equal to half (step S71: Yes). As shown in FIG. 7, the content that is a moving image is converted into a still image, and the content that is a still image remains as a still image (16 bpp). On the other hand, if it is not less than half (step S71: No), in step S73, only the normal image processing is executed while the content that is a moving image remains a moving image and the content that is a still image remains a still image. .

  Then, after each process in step S66, step S68, step S70, step S72 or step S73, the server apparatus 101 displays display data (see FIG. 8) to be reproduced (displayed) by the mobile terminal device 104 in step S74. In step S75, the display data generated in step S74 is transmitted to the mobile terminal device 104.

  Returning to the description of FIG. 5, in step S <b> 54, the mobile terminal device 104 determines whether or not the display data transmitted from the server device 101 has been received. If it is determined that the display data has been received (step S54: Yes), the type (data type) of the display data is analyzed in step S55.

FIG. 8 is a diagram illustrating an example of a data structure of display data generated by the server apparatus 101 and transmitted to the mobile terminal apparatus 104.
As shown in FIG. 8, the display data is transmitted to the mobile terminal device 104 together with the address, data type, and display address indicating the display position of the mobile terminal device 104 that is the transmission destination. Note that the data type is a 16 bpp still image in which the data type “0” is 16 bits per pixel, a data type “1” is a 8 bpp still image, a data type “2” is a 1 bpp still image, data The type “3” is a moving image of 30 frames per second, the data type “4” is a moving image of 10 frames per second, and the data type “5” is a moving image of 1 frame per second.

  Returning to the description of FIG. 5, in step S56, the mobile terminal device 104 determines whether or not the type of the display data analyzed in step S55 is “1 bpp still image”, that is, whether or not the data type is “2”. If it is “1 bpp still image” (step S56: Yes), in step S57, the display data of “1 bpp still image” received in step S54 is displayed and the other “1 bpp still image” is displayed. If not (Step S56: No), the process proceeds to Step S58.

  Next, in step S58, the mobile terminal device 104 determines whether or not the type of display data analyzed in step S55 is “8 bpp still image”, that is, whether or not the data type is “1”. If it is “8 bpp still image” (step S58: Yes), display data of “8 bpp still image” received in step S54 is displayed in step S59, and if it is not “8 bpp still image” (step S59) S58: No) In step S60, the display data of the “16 bpp still image” received in step S54 is displayed. Here, it is assumed that the display data received in step S54 is any one of “1 bpp still image”, “8 bpp still image”, and “16 bpp still image”. If 5) is included, moving image data is determined and displayed in the same manner. The color resolution may be, for example, 24 bpp or more.

  By executing such processing, a battery-driven client device such as the mobile terminal device 104 has a low battery remaining capacity, and thus it is difficult to reproduce content with a large processing load such as a moving image. However, still images that are part of moving images can be reproduced.

FIG. 9 is a diagram illustrating a data structure of a 16 bpp still image, and FIG. 10 is a diagram illustrating a data structure of an 8 bpp still image.
The amount of image data can be reduced by a factor of two by processing the 16 bpp still image shown in FIG. 9 into an 8 bpp still image as shown in FIG. 10 (color reduction processing). Similarly, it can be reduced to 1/8 by changing from 8 bpp to 1 bpp.

  In the case of moving images, the display is normally updated at 10 or 30 frames / second, so the data amount of display data can be reduced to 1/10 or 1/30 just by setting it to 1 frame / second. be able to.

  Further, instead of changing the color resolution, the compression rate of the image data may be changed. When transferring a still image or the like, the data amount is reduced by compressing the normal data. However, in the case of a still image such as a photographic image, the compression rate is extremely low. Therefore, photographic images and the like are filled with a single color, that is, by deleting still images as photographic images, the compression efficiency can be increased and the amount of data can be reduced.

  For example, in the processing of the browser used in the client device, the client device normally analyzes and processes the data in the HTML format, and when the remaining battery level is low (for example, 30% to 50%), the server device 101 side Data in HTML format may be converted into display data of the display screen size of the client device and transmitted. If the remaining battery level is low (for example, 30% or less), the data may be converted into text data and transmitted.

  Thereby, if it is 50% or less, it becomes possible to reduce the power consumption on the client device side by relaxing the browser processing by the client device. If it is 30% or less, the data amount of the display image is reduced, and it becomes possible to suppress power consumption.

Note that the battery capacity information includes not only the remaining battery capacity but also the usable time indicating how long the battery can be used, the voltage value when the voltage value drop characteristic is known, and the like.
The embodiment of the present invention described above can be realized by firmware or software on a hardware, a DSP (Digital Signal Processor) board or a CPU board as one function of the server apparatus or the client apparatus.

  The embodiments of the present invention have been described above with reference to the drawings. However, the server device and the client device to which the present invention is applied are limited to the above-described embodiments as long as their functions are executed. Needless to say, a single device, a system composed of a plurality of devices, an integrated device, or a system that performs processing via a network such as a LAN or WAN may be used. .

  It can also be realized by a system including a CPU, a ROM or RAM memory connected to a bus, an input device, an output device, an external recording device, a medium driving device, and a network connection device. That is, a ROM or RAM memory, an external recording device, and a portable recording medium in which a software program for realizing the system according to the above-described embodiment is recorded are supplied to the server device and the client device. Needless to say, this can also be achieved by the computer of the apparatus reading and executing the program.

  In this case, the program itself read from the portable recording medium or the like realizes the novel function of the present invention, and the portable recording medium or the like on which the program is recorded constitutes the present invention.

  Examples of portable recording media for supplying the program include flexible disks, hard disks, optical disks, magneto-optical disks, CD-ROMs, CD-Rs, DVD-ROMs, DVD-RAMs, magnetic tapes, and nonvolatile memory cards. Various recording media recorded via a network connection device (in other words, a communication line) such as a ROM card, electronic mail or personal computer communication can be used.

  The computer (information processing apparatus) executes the program read out on the memory, thereby realizing the functions of the above-described embodiment, and an OS running on the computer based on the instructions of the program. Performs part or all of the actual processing, and the functions of the above-described embodiments are also realized by the processing.

  Furthermore, a program read from a portable recording medium or a program (data) provided by a program (data) provider is stored in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. After being written, the CPU of the function expansion board or function expansion unit performs part or all of the actual processing based on the instructions of the program, and the functions of the above-described embodiments are also realized by the processing. obtain.

  That is, the present invention is not limited to the embodiment described above, and can take various configurations or shapes without departing from the gist of the present invention.

1 is a diagram showing an outline of a network configuration of a server client system 1. FIG. It is a figure which shows the process sequence of this invention. 2 is a diagram showing an outline of the configuration of a server device 101. FIG. It is a figure which shows the outline of a structure of the mobile terminal device 104 which is an example of a battery-driven client apparatus. 7 is a flowchart showing a flow of processing executed in the mobile terminal device 104. 3 is a flowchart showing a flow of processing executed in the server apparatus 101. It is the figure which showed the corresponding relationship with a battery remaining charge, the display color, and the data format of display data. 6 is a diagram illustrating an example of a data structure of display data generated by the server apparatus 101 and transmitted to the mobile terminal apparatus 104. FIG. It is a figure which shows the data structure of a still image of 16bpp. It is a figure which shows the data structure of a still image of 8 bpp.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Server client system 101 Server apparatus 102 Client terminal apparatus 103 Wireless access point 104 Mobile terminal apparatus 105 Smartphone 109 Network 300 Bus 301 CPU
302 Memory 303 Input unit 304 Display unit 305 Storage unit 306 Database control unit 307 Network connection unit 308 Content database 400 Bus 401 CPU
402 Memory 403 Input unit 404 Display unit 405 Storage unit 406 Recording medium drive unit 407 Network connection unit 408 Recording medium 409 Power supply control unit 410 Secondary battery

Claims (9)

In the client device that reproduces the content data transmitted from the server device,
Content request transmitting means for transmitting request information for requesting the server device to transmit the content data;
Content receiving means for receiving the content data transmitted from the server device;
Battery capacity measuring means for measuring the capacity of a battery for driving the client device;
Battery capacity transmitting means for transmitting battery capacity information indicating the capacity of the battery measured by the battery capacity measuring means to the server device;
Data format determining means for determining the data format of the content data received by the content receiving means;
Content reproducing means for reproducing the content data received by the content receiving means in accordance with the data format determined by the data format determining means;
A client device comprising:   The client apparatus according to claim 1, wherein the battery capacity transmission unit transmits the battery capacity information when an event occurs in the client apparatus. In a server device that transmits content data to the client device according to a request from the client device,
Content request receiving means for receiving request information transmitted from the client device for requesting transmission of the content data to the client device;
Battery capacity receiving means for receiving battery capacity information transmitted from the client apparatus and indicating the capacity of the battery for driving the client apparatus;
Content processing means for processing the content and creating processed content based on the battery capacity information received by the battery capacity receiving means;
Content transmitting means for transmitting the processed content to the client device based on the battery capacity information received by the battery capacity receiving means;
A server apparatus comprising:   4. The server apparatus according to claim 3, wherein, when the content is a moving image, the content processing unit thins out a frame constituting the moving image and processes the frame into a thinned moving image.   5. The server apparatus according to claim 3, wherein the content processing unit processes the color image into a black and white image when the content is a color image.   6. The content processing unit according to claim 3, wherein when the content is a high-quality image, the content processing unit processes the high-quality image into a low-quality image. Server device.   The server apparatus according to claim 3, wherein the content processing unit compresses the content and processes the content into a compressed content. A client device computer that reproduces content data transmitted from a server device,
Content request transmitting means for transmitting request information for requesting the server device to transmit the content data;
Content receiving means for receiving the content data transmitted from the server device;
Battery capacity measuring means for measuring the capacity of a battery for driving the client device;
Battery capacity transmitting means for transmitting battery capacity information indicating the capacity of the battery measured by the battery capacity measuring means to the server device;
Data format judging means for judging the data format of the content data received by the content receiving means;
Content reproducing means for reproducing the content data received by the content receiving means in accordance with the data format determined by the data format determining means;
Program to function as. A server device computer for transmitting content data to the client device in accordance with a request from the client device;
Content request receiving means for receiving request information transmitted from the client device for requesting transmission of the content data to the client device;
Battery capacity receiving means for receiving battery capacity information transmitted from the client apparatus and indicating a capacity of a battery for driving the client apparatus;
Content processing means for processing the content and creating processed content based on the battery capacity information received by the battery capacity receiving means;
Content transmitting means for transmitting the processed content to the client device based on the battery capacity information received by the battery capacity receiving means;
Program to function as.