JP4633029B2 - PRE-PLAYING PROCESSING METHOD, PROGRAM, AND SELECTED CONTENT PREDICTION DEVICE - Google Patents

Description

  The present invention relates to a pre-reproduction processing method, a program, and a selected content prediction apparatus.

  In order to play back encrypted content such as digital broadcast recorded content, it is necessary to perform authentication between the server that records the recorded content and the playback device on the user side. However, since this authentication process takes time, there is currently a waiting time of about 5 to 6 seconds from when the user gives a playback instruction until the recorded content is displayed. In addition to the above-described authentication processing, the necessary processing before playback of recorded content causes the waiting time such as processing for searching for content requested by the user on the server and processing for starting the decoder in the user device. There is processing.

  Even when a digital broadcast video is received, there is a similar problem that a certain waiting time is generated after the user selects a broadcast program until the video is displayed on the television screen. As a technique for solving this problem of waiting time, an invention of a “television signal receiving apparatus” described in Japanese Patent Application Laid-Open No. 8-111823 is known. This “television signal receiving apparatus” is an invention in a television signal receiving apparatus that receives a television signal of a program of a predetermined channel and outputs the received signal. The receiving means receives the television signal. The selection screen output means is operated when outputting a selection screen signal for selecting a predetermined one of the plurality of programs by moving the cursor. The moving means is operated when moving the cursor. The selection means is operated when selecting the program designated by the cursor. When the cursor is moved in response to the operation of the moving unit, the control unit controls the receiving unit to receive the program specified by the cursor before the selection unit is operated. .

  “Control device” described in Japanese Patent Application Laid-Open No. 2004-247554 is an invention in a control device that transmits a command signal to an electronic device to be controlled in response to a user operation on a user interface. The detection means detects a user operation on the user interface. The storage means stores the detection result of the detection means as operation history information. The determination unit refers to the operation history information stored by the storage unit and determines whether or not to transition from the normal mode to the operation estimation mode. A transmission means transmits the command signal corresponding to the said user's operation detected by the said detection means as a process of the said normal mode, when it determines with not changing to the said operation estimation mode by the said determination means. At the same time, when the determination means determines that the transmission means transitions to the operation estimation mode, as the process of the operation estimation mode, the command signal corresponding to the user operation detected by the detection means Send different command signals.

Japanese Patent Laid-Open No. 8-111823 Japanese Patent Laid-Open No. 2004-247554

  An object of the present invention is to reduce a user's feeling of irritation by compressing a waiting time that occurs after a user gives an instruction to reproduce recorded content until the recorded content is reproduced or displayed.

  [Means for Solving the Problems] will be described below using the numbers and symbols used in [Best Mode for Carrying Out the Invention]. These numbers and symbols are added in parentheses in order to clarify the correspondence between the description of [Claims] and [Best Mode for Carrying Out the Invention]. However, these numbers and symbols should not be used for the interpretation of the technical scope of the invention described in [Claims].

  In the prior reproduction processing method according to the present invention, the detecting step detects a relative position of the cursor displayed on the selection screen for selecting content with the selection screen. The predicting step predicts content that the user may select based on the position of the cursor. In the starting step, before the user performs an operation of selecting the content, the necessary processing is started before the reproduction of the predicted one or more contents is started.

  In the pre-play processing method according to the present invention, the predicting step includes content that the user may select, content indicated by the cursor, and all other content displayed on the selection screen. Predict. In the pre-play processing method according to the present invention, the predicting step may be performed when the selection screen is a selection screen for selecting content by moving the cursor relatively in two directions, forward and backward. The content that can be selected by the user is predicted as the content indicated by the cursor and the content within a predetermined range before and after the content. In the pre-reproduction processing method according to the present invention, the content in the predetermined range before and after the cursor is positioned at the edge of the screen, so that the predetermined range on the front side or the predetermined range on the back side is on the selection screen. If it is not displayed on the screen, the content is in a predetermined range on the front side or a predetermined range on the rear side displayed by relatively scrolling the selection screen. In the pre-play processing method according to the present invention, the predicting step may be performed when the selection screen is a selection screen for selecting content by moving the cursor upward, downward, leftward, and rightward. The content that can be selected by the user is predicted to be the content indicated by the cursor and the content within a predetermined range in the vertical and horizontal directions from the content. Further, in the pre-play processing method according to the present invention, the content within a predetermined range in the up and down direction and the left and right direction, the user performs a key operation to move the cursor up, down, left, or right. Content in a range that the cursor can reach by a predetermined number of key operations.

In the prior reproduction processing method according to the present invention, the step of detecting the position detects a relative position of the cursor displayed on the selection screen for selecting content with respect to the selection screen. The step of detecting the moving direction detects the moving direction of the cursor. The step of detecting the movement amount detects a movement amount of the cursor per unit time. In the predicting step, content that the user may select is predicted based on the position of the cursor, the moving direction, and the moving amount per unit time. In the starting step, before the user performs an operation of selecting the content, the necessary processing is started before the reproduction of the predicted one or more contents is started. In the pre-play processing method according to the present invention, the step of predicting may include content that the user may select when the cursor moves with a movement amount larger than a predetermined threshold. Stop predicting. In the pre-reproduction processing method according to the present invention, the step of predicting may include m ranges in the moving direction of the cursor when the cursor moves with a movement amount smaller than a predetermined threshold. And the content in the range of n in the direction opposite to the traveling direction are predicted as the content that the user may select, provided that m> n or m = n. In the pre-reproduction processing method according to the present invention, the step of predicting includes a range of m ₁ in the moving direction of the cursor when the cursor moves with a movement amount smaller than a predetermined threshold. If the amount of movement of the cursor is further reduced after predicting that the content at the location is likely to be selected by the user, the content in the range of m _{2 in the} direction of the cursor is displayed by the user. It is predicted that the content may be selected, provided that m ₁ > m ₂ or m ₁ = m ₂ . In the pre-reproduction processing method according to the present invention, the step of predicting may be performed in a direction opposite to the moving direction of the cursor when the cursor moves with a movement amount smaller than a predetermined threshold value. the content in _one range, after the user has predicted that the content that may be selected, further, when the amount of movement of the cursor becomes smaller, the traveling direction of the cursor in the opposite direction the n ₂ The content in the range is predicted as the content that the user may select, provided that n ₁ <n ₂ or n ₁ = n ₂ . In the pre-reproduction processing method according to the present invention, the predicting step includes the same number of movements in the moving direction and the opposite direction when the moving cursor is stopped with a certain moving amount. The content in the n range is predicted as the content that the user may select. In the pre-play processing method according to the present invention, the predicting step may be performed when the selection screen is a selection screen for selecting content by moving the cursor upward, downward, leftward, and rightward. When the cursor that has been moved with a certain amount of movement stops, at least one that is in the left-right direction in a direction that intersects the direction in which the cursor has moved, that is, if the cursor has moved up and down One content or at least one content in the vertical direction when the cursor has moved in the horizontal direction is predicted as a content that the user may select.

Further, in the program according to the present invention, the procedure for detecting the relative position of the cursor displayed on the selection screen for selecting content with respect to the selection screen and the position of the cursor is selected by the user. The computer includes a procedure for predicting content that is likely to be performed, and a procedure for starting necessary processing before starting playback of the predicted content or content before the user performs an operation of selecting content. Let it run. In the selected content prediction apparatus (10) according to the present invention, the cursor position detection unit (12) has a relative position of the cursor displayed on the selection screen for selecting content with respect to the selection screen. Is detected. The pre-reproduction target determining unit (11) predicts the content that the user may select based on the position of the cursor and before the user performs an operation of selecting the content, Request to start necessary processing before starting playback.

  According to the present invention, it is possible to reduce a waiting time that occurs after a user gives an instruction to reproduce recorded content until the recorded content is displayed, so that the user's frustration is reduced.

  FIG. 1 shows a first example of a selection screen for selecting content. In FIG. 1, the contents displayed on the selection screen are sorted in date order. From the top of the screen, “Drama A first episode broadcast on September 6, 2006”, “Drama B first episode broadcast on September 8, 2006”, “September 13, 2006” The second episode of Drama A broadcast on the day ”,“ The second episode of Drama B broadcast on September 15, 2006 ”,“ The third episode of Drama A broadcast on September 20, 2006 ” Each content of “the third episode of drama B broadcast on September 22, 2006” is displayed. The user performs a key operation for moving the cursor using the remote controller, and overlays the cursor on the content to be viewed. Next, a key operation for selecting content is performed, and the selected content is viewed. Now, the user is hovering over the “second episode of drama B broadcast on September 15, 2006”. Next, the user performs a key operation for selecting the content. In the present invention, prior authentication and other processes are started before the user performs a key operation for selecting the content. Here, pre-authentication and other processes are started for all contents displayed on the selection screen. When the user performs a key operation to select “the second episode of drama B broadcasted on September 15, 2006”, pre-authentication and other processes have already been started for this content. However, the waiting time until the reproduction of “the second episode of drama B broadcasted on September 15, 2006” after the operation of selecting the content is started becomes very short. Also, from the second episode of Drama B broadcast on September 15, 2006, where the user once superimposed the cursor, the third episode of Drama A broadcast on September 20, 2006 was immediately Even if the cursor is moved again so that the cursor is overlaid and a key operation for selecting this content is performed, pre-authentication and other processes are started for all the content displayed on the selection screen. Therefore, the time until playback is started is very short.

  FIG. 2 shows a second example of a selection screen for selecting content. In FIG. 2, the contents displayed on the selection screen are sorted in date order. From the top of the screen, “Drama A first episode broadcast on September 6, 2006”, “Drama B first episode broadcast on September 8, 2006”, “September 13, 2006” The second episode of Drama A broadcast on the day ”,“ The second episode of Drama B broadcast on September 15, 2006 ”,“ The third episode of Drama A broadcast on September 20, 2006 ” Each content of “the third episode of drama B broadcast on September 22, 2006” is displayed. The user performs a key operation for moving the cursor using the remote controller, and overlays the cursor on the content to be viewed. Next, a key operation for selecting content is performed, and the selected content is viewed. Now, the user is hovering over the “drama B 3rd episode broadcast on September 22, 2006”. Next, the user performs a key operation for selecting the content. In the present invention, prior authentication and other processes are started before the user performs a key operation for selecting the content. Here, pre-authentication and other processes are started for content in two ranges before and after the content where the cursor is located. In the figure, since the cursor is on the content in the lowermost column of the selection screen, the content behind this content is not displayed on the selection screen. Therefore, the content to be displayed is determined by scrolling the selection screen. On the back side, two contents of “Drama A 4th episode broadcast on September 27, 2006” and “Drama B 4th episode broadcast on September 29, 2006” are lined up. Is not displayed. Although not displayed on the selection screen, pre-authentication and other processes are also started for these two contents. Now, when the user performs a key operation to select “3rd episode of drama B broadcasted on September 22, 2006”, after a while, “September 22, 2006” appears on the TV screen. The content of “3rd episode of drama B” broadcasted on is displayed. Since the pre-authentication and other processes have already been started for this content, after the user performs an operation of selecting the content, “the third episode of drama B broadcasted on September 22, 2006” The waiting time until the playback of is started becomes very short.

  FIG. 3 shows a third example of a selection screen for selecting content. FIG. 3 is an example of a selection screen for selecting content by moving the cursor upward, downward, leftward, and rightward. In FIG. 3, the contents displayed on the selection screen are arranged for each channel. On the screen, the content “AAA” and the content “DDD” are displayed in the column for one channel. Further, the content “FFF” is displayed in the 3 channel column, and the content “BBB” and the content “GGG” are displayed in the 4 channel column. Although not displayed on the selection screen of FIG. 3, when the selection screen is scrolled to the right, the content “EEE” is displayed in the 6-channel column, and “CCC” is displayed in the 8-channel column. The content is displayed. Using the remote controller, the user performs key operations for moving the cursor in the vertical direction and the horizontal direction, and overlays the cursor on the content to be viewed. Next, a key operation for selecting content is performed, and the selected content is viewed. Now, the user has placed the cursor on the content “BBB”. Next, the user performs a key operation for selecting the content. In the present invention, prior authentication and other processes are started before the user performs a key operation for selecting the content. Here, pre-authentication and other processes are started for a range of up m, down n, left j, and right k with respect to the position of the cursor. As shown in the figure, “BBB” content, “CCC” content, and “GGG” content are subject to pre-authentication. Here, when the user performs a key operation for selecting the content “BBB”, since the pre-authentication and other processing have already been started for this content, the user performs an operation for selecting the content. Therefore, the waiting time until the reproduction of the content “BBB” is started becomes very short.

  FIG. 4 shows a fourth example of a selection screen for selecting content. In FIG. 4, the contents displayed on the selection screen are sorted in the order of ABC. On the screen, the contents are aligned in the right direction starting from the upper left. In the example of the fourth selection screen, content that does not scroll in the left-right direction and protrudes to the right side of the screen is folded at the right end and displayed on the next line. In the figure, the content of “AAA”, the content of “BBB”, and the content of “CCC” are displayed in the first row. In the second row, “DDD” content, “EEE” content, and “FFF” content are displayed. In the third row, the content “GGG” is displayed. This selection screen can be scrolled up and down, but when scrolling upward, the content “ZZZ” appears before the content “AAA”. Using the remote controller, the user performs key operations for moving the cursor in the vertical direction and the horizontal direction, and overlays the cursor on the content to be viewed. Next, a key operation for selecting content is performed, and the selected content is viewed. Now, the user is placing the cursor on the content of “CCC”. Next, the user performs a key operation for selecting the content. In the present invention, prior authentication and other processes are started before the user performs a key operation for selecting the content. Here, pre-authentication and other processes are started with respect to a range that the user can reach with a single key operation on the basis of the position of the cursor. As shown in the figure, the content of “ZZZ” reached by pressing the up key once, the content of “BBB” reached by pressing the left key once, the content of “CCC” where the cursor is located, the right key 1 The content of “DDD” that is reached by pressing the button once and the content of “FFF” that is reached by pressing the down key once are pre-authentication targets. Here, when the user performs a key operation to select the content of “CCC”, pre-authentication and other processes have already been started for this content, so the user performs an operation of selecting the content. Therefore, the waiting time until the reproduction of the content of “CCC” is started becomes very short.

5 to 7 show a fifth example of a selection screen for selecting content. 5 to 7, focusing on the movement of the cursor, the contents to be pre-authenticated and other processes are narrowed down. First, when the cursor moves very fast and exceeds a preset cursor stagnation time threshold, the content pre-authentication and other processing are not performed. This is because when the cursor moves very quickly, it is determined that the user still selects the content before, so that it can be predicted that the content near the cursor will not be selected. Next, as shown in FIG. 5, when the cursor moves fast but does not exceed the preset threshold value of the cursor stagnation time, the content pre-authentication and other processes are started. The number of contents to be pre-authenticated is m _{1 in the} direction of movement of the cursor and n _{1 in the} direction opposite to the direction of movement of the cursor. However, since it can be predicted that the user is highly likely to select content in the direction in which the cursor moves, m ₁ > n ₁ or m ₁ = n ₁ is set. Subsequently, as shown in FIG. 6, when the cursor moves slowly and does not exceed the preset threshold value of the cursor stagnation time, the content pre-authentication and other processes are continued. The number of contents to be pre-authenticated is m _{2 in the} direction of movement of the cursor and n _{2 in the} direction opposite to the direction of movement of the cursor. However, since it is predicted that the user is highly likely to select content in the direction in which the cursor moves, m ₂ > n ₂ or m ₂ = n ₂ is set. In addition, it is predicted that the possibility that the content in the moving direction of the cursor is selected is higher when the cursor moves fast than when the cursor moves slowly. Therefore, when the cursor moves quickly, a larger number of contents in the direction of cursor movement are targeted for pre-authentication. In addition, when the cursor moves slowly, a smaller number of contents in the direction of cursor movement are targeted for pre-authentication. Specifically, the contents to be pre-authenticated are narrowed down so that m ₁ > m ₂ or m ₁ = m ₂ . On the other hand, the possibility that the content in the direction opposite to the moving direction of the cursor is selected is predicted to be higher when the cursor moves slowly than when the cursor moves fast. Therefore, when the movement of the cursor is slow, a larger number of contents in the direction opposite to the moving direction of the cursor are targeted for pre-authentication. In addition, when the cursor moves quickly, a smaller number of contents in the direction opposite to the cursor moving direction are set as pre-authentication targets. Specifically, the contents to be pre-authenticated are narrowed down so that n ₁ <n ₂ or n ₁ = n ₂ . The relationship between the cursor movement described above and the content to be pre-authenticated will be described in detail based on a specific example. In order to facilitate understanding, assume that the number of contents to be pre-authenticated is set to six. At this time, in addition to one piece of content where the cursor is located, five pieces of content are subject to pre-authentication. For example, when the cursor moves at a high speed within a range that does not exceed a preset threshold value of the cursor stagnation time, five contents in the cursor traveling direction are set as pre-authentication targets. When the cursor moves at a medium speed, four contents in the direction of cursor movement are subject to pre-authentication, and one content in the direction opposite to the direction of cursor movement is subject to pre-authentication. When the movement of the cursor becomes slow, three contents in the direction of cursor movement are subject to pre-authentication, and two contents in the direction opposite to the direction of cursor advance are subject to pre-authentication. Thus, the range of content to be pre-authenticated can be changed according to the amount of movement of the cursor per unit time. Finally, as shown in FIG. 7, when the movement of the cursor is stopped, the content to be pre-authenticated is m ₃ pieces in the direction in which the cursor is moving, and the direction in which the cursor is moving Predict n _{3 in the} reverse direction. If the movement of the cursor stops, the user can predict that there is a possibility of moving the cursor with equal probability in either direction. Therefore, m ₃ = n ₃ .

8 to 10 show a sixth example of a selection screen for selecting content. 8 to 10 are examples of selection screens for selecting content by moving the cursor upward, downward, leftward, and rightward. 8 to 10, similarly to FIGS. 5 to 7, focusing on the movement of the cursor, the contents to be pre-authenticated and other processes are narrowed down. In the figure, the cursor moves up and down the 4 channel column and is positioned on the content of “BBB”. First, when the movement of the cursor is very fast and exceeds a preset cursor stagnation time threshold, the content pre-authentication and other processing are not performed. This is because when the cursor moves very quickly, it is determined that the user still selects the content before, so that it can be predicted that the content near the cursor will not be selected. Next, as shown in FIG. 8, if the cursor moves fast but does not exceed a preset cursor stagnation time threshold, pre-authentication of content and other processes are started. The number of contents to be pre-authenticated is m _{1 in the} direction of movement of the cursor and n _{1 in the} direction opposite to the direction of movement of the cursor. However, since it can be predicted that the user is highly likely to select content in the direction in which the cursor moves, m ₁ > n ₁ or m ₁ = n ₁ is set. Subsequently, as shown in FIG. 9, when the movement of the cursor is slow and does not exceed the preset threshold value of the cursor stagnation time, the content pre-authentication and other processes are continued. The number of contents to be pre-authenticated is m _{2 in the} direction of movement of the cursor and n _{2 in the} direction opposite to the direction of movement of the cursor. However, since it is predicted that the user is highly likely to select content in the direction in which the cursor moves, m ₂ > n ₂ or m ₂ = n ₂ is set. In addition, it is predicted that the possibility that the content in the moving direction of the cursor is selected is higher when the cursor moves fast than when the cursor moves slowly. Therefore, when the cursor moves quickly, a larger number of contents in the direction of cursor movement are targeted for pre-authentication. In addition, when the cursor moves slowly, a smaller number of contents in the direction of cursor movement are targeted for pre-authentication. Specifically, the contents to be pre-authenticated are narrowed down so that m ₁ > m ₂ or m ₁ = m ₂ . On the other hand, the possibility that the content in the direction opposite to the moving direction of the cursor is selected is predicted to be higher when the cursor moves slowly than when the cursor moves fast. Therefore, when the movement of the cursor is slow, a larger number of contents in the direction opposite to the moving direction of the cursor are targeted for pre-authentication. In addition, when the cursor moves quickly, a smaller number of contents in the direction opposite to the cursor moving direction are set as pre-authentication targets. Specifically, the contents to be pre-authenticated are narrowed down so that n ₁ <n ₂ or n ₁ = n ₂ . Finally, as shown in FIG. 10, when the movement of the cursor is stopped, the contents to be pre-authenticated are m ₃ pieces in the direction in which the cursor is moving, and the direction in which the cursor is moving. Predict n _{3 in the} reverse direction. When the movement of the cursor stops, the user can predict that there is a possibility of moving the cursor with the same probability in either direction, so m ₃ = n ₃ is set. By the way, in the case where the selection screen is a selection screen for selecting content by moving the cursor upward, downward, leftward, and rightward, the stopped cursor again intersects the direction in which it was proceeding. It can be predicted that there is a possibility to start moving in the direction. Therefore, in this example, as shown in FIG. 10, the content in the left direction of the stopped cursor and the content in the right direction are set as pre-authentication targets. At least one content to be pre-authenticated is taken leftward from the cursor position and at least one content rightward from the cursor position.

  FIG. 11 shows a system configuration example according to the embodiment of the present invention. In FIG. 11, the prediction device 10 includes a cursor position detection unit 12 that detects the position of the cursor displayed on the selection screen, a cursor movement amount detection unit 13 that detects a movement amount of the cursor per unit time, and a cursor movement. And a pre-authentication target determining unit 11 that determines content to be pre-authenticated based on the position of the cursor, the amount of movement per unit time, and the movement direction. Have. The content reproduction apparatus 20 includes a content storage server 30, a network control unit 21 that transmits and receives an encryption key and content data, a content encryption / decryption unit 22 that decrypts encrypted content data, and decrypted content data And a content authentication unit that requests the content storage server 30 to authenticate that the content playback device 20 is properly registered, and requests an encryption key of the recorded content to be played back. 24, and a content encryption key generation / storage unit 25 for generating a decryption encryption key from the encrypted encryption key and storing the encryption key for decrypting the recorded content. Here, it is assumed that the pre-authentication object determination unit 11 of the prediction device 10 determines that the five contents {CCC, DDD, EEE, FFF, GGG} should be pre-authentication objects. At this time, the pre-authentication target determination unit 11 does not wait for the user to perform an operation of selecting content, and sends the five content {CCC, DDD, EEE, FFF, GGG} is requested to start authentication. Upon receiving this request, the mutual authentication unit 24 immediately starts authentication. When the authentication is completed, the encryption keys of the five contents {CCC, DDD, EEE, FFF, GGG} are stored in the content encryption key generation / storage unit 25. Next, when the cursor displayed on the selection screen has moved, the pre-authentication target determination unit 11 should make another five contents {DDD, EEE, FFF, PPP, QQQ} to be pre-authenticated. Suppose you decide. At this time, the pre-authentication target determination unit 11 does not wait for the user to perform an operation of selecting content, and the newly added content {PPP, QQQ} is added to the mutual authentication unit 24 of the content reproduction device 20. Request to start authentication. Upon receiving this request, the mutual authentication unit 24 immediately starts authentication. When the authentication is completed, the encryption key of the content {PPP, QQQ} is added to the content encryption key generation / storage unit 25. At the same time, the pre-authentication target determination unit 11 notifies the content encryption key generation / storage unit 25 to discard these encryption keys for the content {CCC, GGG} that is not the authentication target. Upon receiving this notification, the content encryption key generation / storage unit 25 discards the encryption key of the content {CCC, GGG}. Subsequently, it is assumed that the user performs an operation of selecting content {EEE}. The content encryption key generation / storage unit 25 stores encryption keys for five contents {DDD, EEE, FFF, PPP, QQQ}. Therefore, the content reproduction device 20 can quickly reproduce the content data of the content {EEE} using the encryption key of the content {EEE}.

FIG. 1 is a diagram illustrating a first example of a selection screen for selecting content. FIG. 2 is a diagram illustrating a second example of a selection screen for selecting content. FIG. 3 is a diagram illustrating a third example of a selection screen for selecting content. FIG. 4 is a diagram showing a fourth example of a selection screen for selecting content. FIG. 5 is a diagram showing a fifth example (when fast) of a selection screen for selecting content. FIG. 6 is a diagram showing a fifth example (when late) of a selection screen for selecting content. FIG. 7 is a diagram showing a fifth example (when stopped) of a selection screen for selecting content. FIG. 8 is a diagram showing a sixth example (if fast) of a selection screen for selecting content. FIG. 9 is a diagram illustrating a sixth example (when late) of a selection screen for selecting content. FIG. 10 is a diagram illustrating a sixth example (when stopped) of a selection screen for selecting content. FIG. 11 is a diagram showing a system configuration example according to the embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Prediction apparatus 11 Prior authentication object determination part 12 Cursor position detection part 13 Cursor movement amount detection part 14 Cursor movement direction detection part 20 Content reproduction apparatus 21 Network control part 22 Content encryption / decryption part 23 Content reproduction part 24 Mutual authentication part 25 Content encryption Key generation / storage unit 30 Content storage server

Claims (8)

Detecting a cursor position detection unit, the cursor displayed on the selection screen for selecting a content, the relative position between the selection screen,
A cursor movement direction detection unit detecting a movement direction of the cursor;
A cursor movement amount detection unit detecting a movement amount of the cursor per unit time; and
A step in which a pre-authentication target determining unit predicts content that the user may select based on the position of the cursor, the moving direction, and the amount of movement per unit time;
The step of predicting comprises:
When the pre-authentication target determination unit moves the cursor with a movement amount larger than a predetermined threshold, the prediction of content that the user may select is stopped,
A pre-authentication target determination unit having a step of causing a content reproduction device to start necessary processing before starting reproduction of one or a plurality of predicted contents before the user performs an operation of selecting the content Playback processing method. The step of predicting comprises:
When the cursor is moving with a movement amount smaller than a predetermined threshold, the content is in the m range in the moving direction of the cursor and is in the n range in the direction opposite to the moving direction. The prior reproduction processing method according to claim 1, wherein the content is predicted as content that the user may select.
However, m> n or m = n. The step of predicting comprises:
After predicting content in the range of m _{1 in the} direction of cursor movement as content that the user may select when the cursor is moving with a movement amount smaller than a predetermined threshold further, when the amount of movement of the cursor becomes smaller, according to content in a range traveling direction into _two m of the cursor, to claim 1 or 2 users predict the content that may be selected Pre-play processing method.
However, m _1> m _2, or, and m ₁ = m _2. The step of predicting comprises:
Content in which the user may select content in the n ₁ range in the direction opposite to the direction of movement of the cursor when the cursor moves with a movement amount smaller than a predetermined threshold. If the amount of movement of the cursor is further reduced after the prediction, the content in the range of n _{2 in the} direction opposite to the moving direction of the cursor is predicted as the content that the user may select. The prior regeneration processing method according to any one of claims 1 to 3 .
However, it is assumed that n ₁ <n ₂ or n ₁ = n ₂ . The step of predicting comprises:
When a cursor that has been moved with a certain amount of movement stops, content that may allow the user to select content in the same number of n ranges in the direction that the cursor was moving and in the opposite direction The prior reproduction processing method according to any one of claims 1 to 4, which predicts: The step of predicting comprises:
When the selection screen is a selection screen for selecting content by moving the cursor upward, downward, leftward, and rightward, when the cursor that has moved with a certain amount of movement stops, When the cursor is moving up and down, at least one content in the left and right direction, or when the cursor is moving in the left and right direction The pre-reproduction processing method according to any one of claims 1 to 5, wherein at least one content in the vertical direction is predicted as content that may be selected by a user. The program for making a computer perform the prior reproduction | regeneration processing method of any one of Claims 1 thru | or 6 . A cursor position detection unit for detecting a relative position of the cursor displayed on the selection screen for selecting content with respect to the selection screen;
A cursor movement amount detection unit for detecting the movement amount of the cursor per unit time;
A cursor movement direction detection unit for detecting the movement direction of the cursor;
Predicting content that the user may select based on the position , amount of movement, and direction of movement of the cursor, and before the user performs an operation of selecting content, the predicted one or more content, A pre- authentication target determination unit that requests to start necessary processing before starting reproduction ,
The pre-authentication target determination unit stops prediction of content that the user may select when the cursor moves with a movement amount larger than a predetermined threshold. A prediction device for selected content.

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