JP2008263540A - Content display device and content display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To promptly display content even when the content is displayed by switching arrangement conditions. <P>SOLUTION: This content display device is characterized by including: a content storage means for acquiring the content stored in a storage device according to the arrangement conditions set by every temporary storage device and storing the content in the respective temporary storage devices; a reading means for reading the content stored in the corresponding temporary storage device based on the selected arrangement conditions; a display control means for displaying the read content; and a content information control means for transferring display selection content information indicating selection content stored in a temporary storage device corresponding to the selected arrangement conditions when the selection content is changed among the content which is displayed and transferring reference content information indicating the content corresponding to the selection content and to be a reference in a temporary storage device different from the temporary storage device. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a content display device and a content display method for displaying content on a display device.

  In recent years, content can be stored in devices such as a camera that captures content and a disk recorder that records broadcast content and the like. There is also a display device that can display a list of contents stored in such a device.

  Some of such display devices display a content list as a content name in text. There is also a display device that explicitly displays a summary of content by displaying a thumbnail of the content or partially reproducing a characteristic part. In such a display device, contents are displayed in a list in various orders such as date order or file name order so that an outline of the contents can be displayed in an easy-to-understand manner and the target contents can be searched quickly.

  However, when displaying the list of contents and thumbnails by switching them in various orders, there is a problem that the list display of contents and thumbnails cannot be performed quickly because the data is read each time the display is switched.

  In order to solve such a problem, there is a technique for pre-reading a related image such as an enlarged image or a reduced image related to display image data before storing a display operation instruction and storing the image in a buffer so as to display the image quickly (for example, , See Patent Document 1).

  In addition, when displaying images arranged in a fixed array, a technique for displaying images quickly by pre-reading and holding images before and after the currently displayed image or a plurality of images before and after the image. (For example, refer to Patent Document 2).

JP 2001-249653 A JP 2002-101329 A

  However, in the technology for displaying the content described above, when the display of the content arranged under one arrangement condition is switched to the display of the content arranged under a different arrangement condition, it is necessary to read the content again into the buffer. That is, there is a problem that the display speed of the content is slow when displaying with the arrangement conditions switched.

  The present invention has been made in view of such problems, and an object of the present invention is to promptly display content even when the content arrangement conditions are switched and displayed.

  Therefore, the content display device of the present invention is selected with content storage means for acquiring the content stored in the storage device according to the arrangement condition set for each temporary storage device and storing it in each temporary storage device. Based on the arrangement conditions, reading means for reading the content stored in the corresponding temporary storage device, display control means for displaying the content read by the reading means on the display device, and display on the display device When the selected content selected by the user among the contents is changed, display selected content information indicating the selected content stored in the temporary storage device corresponding to the selected arrangement condition is changed according to the change. The temporary storage device corresponding to the selected content and different from the temporary storage device. Reference content information indicating the content to be a reference in the, in response to the change, and having a content information control means for moving.

  The present invention is also a content display method in a content display device, wherein content stored in a storage device is acquired according to an array condition set for each temporary storage device and stored in each temporary storage device. A content storage step, a read step for reading the content stored in the corresponding temporary storage device based on the selected arrangement condition, and a display control step for displaying the content read in the read step on the display device When the selected content selected by the user is changed among the content displayed on the display device, the display indicates the selected content stored in the temporary storage device corresponding to the selected arrangement condition The selected content information is moved in accordance with the change, and the selection is performed. Corresponding to content, the reference content information indicating the content to be a reference in different temporary storage device and the temporary storage device, in response to the change, and having a content information control step of moving.

  The present invention may be a program and a storage medium.

  According to the present invention, it is possible to quickly display content even when the content arrangement conditions are switched and displayed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram illustrating an example of a hardware configuration of a content display device.
In FIG. 1, the content display device 1 includes a CPU 11, a ROM 12, a RAM 13, an input device 14, a display device 15, and a disk 16. The CPU 11, the ROM 12, the RAM 13, the input device 14, the display device 15, and the disk 16 are connected to each other via a bus.

  For example, the CPU 11 reads a program related to content display stored in the disk 16 or the like to the RAM 13 as necessary, and executes processing based on this program. Thereby, the function of the content display device described later is realized, or each step of the flowchart is executed. The ROM 12 stores a program that is first read when the power is turned on, data necessary for executing the program, and the like. The RAM 13 is used as a work memory when the CPU 11 executes processing based on a program. In the present embodiment, the RAM 13 is also used as a buffer described later. The input device 14 inputs information related to a user's content selection operation and input operation. The display device 15 displays a list of contents and the like. The disk 16 as an example of a storage device stores content, metadata, thumbnails, and the like in addition to programs related to content display.

FIG. 2 is a diagram illustrating an example of a functional configuration of the content display device 1.
In FIG. 2, the display UI unit 101 performs control related to the display UI, displays content on the display device 15, selects content displayed on the display device 15 via the input device 14, and switches display. Input (or obtain) data about. Here, the display UI unit 101 is an example of a display control unit.
A display data reading unit 102, which is an example of a reading unit, reads content necessary for display from a reference pointer (display position pointer) in a buffer for display (hereinafter referred to as a current buffer). In addition, the display data reading unit 102 reads a content by switching a buffer related to display, that is, a current buffer among a plurality of buffers according to an instruction from the display UI unit 101. Here, the pointer includes a display position pointer that is information indicating display selection content to be described later in the current buffer, and a reference pointer that indicates reference content corresponding to the display selection content in the background buffer to be described later. The display position pointer is display selection content information indicating the display selection content. The reference pointer is reference content information indicating the reference content.

The current buffer information unit 103 holds current buffer information.
The pointer control unit 104 changes the display position pointer that indicates the position of the content (display selection content) selected by the user among the content displayed in the current buffer and displayed on the display device 15. Move according to. In addition, the pointer control unit 104 moves a pointer (reference pointer) indicating a reference content of a buffer different from the current buffer corresponding to the content indicated by the display position pointer in accordance with the movement of the display position pointer. That is, the pointer control unit 104 moves the reference pointer in conjunction with the movement of the display position point. Here, the pointer control unit 104 is an example of content information control means. Hereinafter, a buffer different from the current buffer is referred to as a background buffer.

The position information unit 105 manages the position information of the display selection content in the current buffer based on the display position pointer. Further, the position information unit 105 manages the position information of the content (reference content) in the background buffer corresponding to the display selection content based on the reference pointer.
A cache content management unit 106, which is an example of content management means, manages content location information in a buffer managed by the location information unit 105 and content loaded in the buffer. In addition, the cache content management unit 106 instructs the database reading unit 107 (to be described later) to read content as necessary.

The database reading unit 107, which is an example of content storage means, creates a command for reading content (hereinafter referred to as a query) according to the array condition (sort condition, group condition) corresponding to the buffer and the number of contents. . The database reading unit 107 creates a query based on an instruction from the cache content management unit 106 and issues it to the database 108.
The database 108 reads the content from the disc 16 under the specified arrangement condition in accordance with the issued query.

Buffers 21 to 23, which are examples of a temporary storage device, temporarily store content read under a specified arrangement condition. That is, the buffer (each temporary storage device) stores the content arranged under different arrangement conditions for each buffer (each temporary storage device).
The array condition holding unit 31 holds array conditions (sort conditions, group conditions) corresponding to the buffer 21. The arrangement condition holding unit 32 holds arrangement conditions corresponding to the buffer 22. The arrangement condition holding unit 33 holds arrangement conditions corresponding to the buffer 23. The database reading unit 107 creates a query using the array conditions of each array condition holding unit.

FIG. 3 is an example showing a conceptual diagram of content pointers arranged for each sort condition in each buffer.
FIG. 3A shows the state of the initial buffer. FIG. 3B shows the state of the buffer when the display selection content is changed. In the example of FIG. 3, the current buffer is designated to be sorted in date order. That is, the sort condition in the date order is held in the array condition holding unit corresponding to the current buffer. Each background buffer is specified to be sorted in order of event and person. That is, each array condition holding unit corresponding to each background buffer holds a sort condition in order of events and a sort condition in order of people.

  A display position pointer 201 indicates the display selection content in the current buffer controlled by the pointer control unit 104. A reference pointer 202 indicates a reference content of a background buffer (for example, the buffer 22) controlled by the pointer control unit 104. A reference pointer 203 indicates the reference content of the background buffer (for example, the buffer 23) controlled by the pointer control unit 104. In the example of FIG. 3, the pointer control unit 104 controls (moves) the reference pointer of the reference content so as to indicate the same content as the display selection content.

  For example, in FIG. 3A, the pointer control unit 104 moves the display position pointer of the display selection content in the current buffer so as to point to the content 2 from the content 3 in accordance with the change in the display selection content by the user (or change). The pointer control unit 104 also moves the reference pointer of the reference content of the background buffer sorted in the order of events so that the content 3 points to the content 2. The pointer control unit 104 also moves the reference pointer of the reference content in the background buffer sorted in the order of people so that the content 3 points to the content 2.

  When the user operates the input device 14 to select the content 4, for example, the pointer control unit 104 changes the display position pointer of the display selection content of the current buffer in accordance with the change of the display selection content of the user. Move as follows. That is, the pointer control unit 104 moves the display position pointer so as to point from the content 2 to the content 4, for example.

  The pointer control unit 104 also tries to move the reference pointers of the reference contents of the background buffer sorted in the order of events so that the contents 2 to 4 are pointed to. However, there is no content 4 in the background buffer sorted in event order. Therefore, the cache content management unit 106 issues an instruction for reading the content 4 to the database reading unit 107. Upon receiving this instruction, the database reading unit 107 creates (issues) a query of the sort condition in the order of events based on the content 4. Next, the database 108 reads the content from the disc 16 according to the specified sort condition in accordance with the issued query. When the database reading unit 107 receives content from the database 108, the database reading unit 107 stores the content on the basis of the content 4 in the background buffer. At this time, the pointer control unit 104 moves the reference pointer of the reference content so as to point to the content 4.

  The pointer control unit 104 also moves the reference pointers of the reference contents in the background buffer sorted in the order of people so that the contents 2 to 4 are indicated. As a result, the state of the buffer becomes as shown in FIG.

4 and 5 are diagrams showing examples of content displayed on the display device 15.
As shown in FIGS. 4 and 5, the current buffer is designated to be sorted in date order. The display UI unit 101 displays the content read from the current buffer via the display data reading unit 102 on the display device 15 as a view (screen) 301. In 301, content 3 is selected as display selection content.

  In this state, the user can select the contents to be sorted in the order of events by operating the screen displayed on the display device 15 using the input device 14 or the like, for example. Thus, switching a display by selecting a sort condition different from the currently selected sort condition is referred to as display switching (array condition change).

  In response to the selection, when the current buffer is changed to a buffer in which contents are sorted in order of events and stored, the display UI unit 101 displays the contents stored in this buffer on the display device 15 in 302 views. Change the display so that Further, as shown in the view 302, the display UI unit 101 displays the content 3 that was the display selection content before the sorting condition was switched as the display selection content. Further, the display UI unit 101 displays content 5, content 9, content 6, and content 2 as content around the display selection content.

  Next, it is assumed that the user operates the screen displayed on the display device 15 using the input device 14 or the like, for example, and selects to sort in the order of persons. In response to the selection, when the current buffer is changed to a buffer in which the contents are sorted in the order of people and stored, the display UI unit 101 displays the contents stored in this buffer on the display device 15 in 303 views. Change the display so that The display UI unit 101 similarly displays the content 3 as display selection content.

Next, from the state in which the contents are arranged as in the view 301 in FIG. 4, the user operates the screen displayed on the display device 15 using the input device 14 or the like to change the display selection content to the content. 3 can be selected to become content 2. In response to the selection, the display UI unit 101 changes the display selection content from the content 3 to the content 2 as indicated by a view 401 in FIG.
Next, the user can operate the screen displayed on the display device 15 using the input device 14 or the like to select the contents to be sorted in the order of events. In response to the selection, when the current buffer is changed to a buffer in which the contents are sorted in order of events and stored, the display UI unit 101 displays the contents stored in this buffer on the display device 15 in the view of 402. Is displayed.
Further, the user can select the contents to be sorted in the order of persons by operating the screen displayed on the display device 15 using the input device 14 or the like. In response to the selection, when the current buffer is changed to a buffer in which the contents are sorted in order of person and stored, the display UI unit 101 displays the contents stored in this buffer on the display device 15 in 403 views. Is displayed.

FIG. 6 is an example showing a conceptual diagram of content pointers arranged for each group condition in each buffer.
In FIG. 6, the current buffer stores contents sorted in date order. Each background buffer stores content grouped monthly and content grouped yearly. That is, each array condition holding unit corresponding to each background buffer holds a group condition for each month or a group condition for each year.
That is, in the example of FIG. 6, it can be said that the arrangement conditions set for each buffer have a group relationship. The date belongs to the month group, and the month belongs to the year group.
The content grouped by month and the content grouped by year may be representative content in the content included as a group, or may be newly created from the content images in the group. It may also be content.

A display position pointer 501 indicates the display selection content in the current buffer controlled by the pointer control unit 104. A reference pointer 502 indicates the reference content of the background buffer controlled by the pointer control unit 104. A reference pointer 503 indicates the reference content of the background buffer controlled by the pointer control unit 104.
The pointer control unit 104 controls (moves) the reference pointer of the reference content so as to point to the grouped content to which the display selection content belongs and the grouped content to which the grouped content belongs.

  In FIG. 6, the display position pointer 501 of the display selection content of the current buffer sorted in date order points to the content 6. In this case, the reference pointer 502 of the reference content of the background buffer in which the content grouped for each month is stored points to the grouped content 13 including the content 6. Similarly, the reference pointer 503 of the reference content in the background buffer in which the content grouped by year is stored points to the grouped content 102 including the grouped content 13.

For example, when the user changes the display selection content, the pointer control unit 104 moves the display position pointer 501 of the display selection content in the current buffer from the content 6 to the content 7. However, the reference pointer 502 of the reference content of the background buffer in which the content grouped every month is stored is also the grouped content 13 and is within the same group, so the pointer control unit 104 moves the reference pointer 502. do not do.
More specifically, the pointer control unit 104 determines whether or not to move the reference pointer in accordance with the movement (change) of the display position pointer 501 and the content group information held by the arrangement condition holding unit and the like. to decide. Here, the content group information, for example, belongs to a group of content 11 in which the content 1 and the content 2 in the current buffer are sorted in month order. Further, the content 11 and the content 12 sorted in the month order belong to the group of the content 101 sorted in the year order.
Similarly, the pointer control unit 104 does not move the reference pointer 503 of the reference content of the background buffer in which the content grouped every year is stored.

  Next, the pointer control unit 104 moves the display position pointer 501 of the display selection content in the current buffer to the content 5 by changing the display selection content of the user. The pointer control unit 104 moves the reference pointer of the reference content of the background buffer of the content grouped every month to the grouped content 12 including the content 5. Further, the pointer control unit 104 moves the reference pointer of the reference content in the background buffer in which the content grouped every year is stored to the grouped content 101 including the grouped content 12. .

  FIG. 7 is a diagram for explaining an example of requirements for reading content into the current buffer. In FIG. 7, the content in the cache content area indicates the content read into the current buffer. Here, the cache content area is an area in which the content in the buffer can be stored. Further, the content in the display content area is content displayed on the display device 15 by the display UI unit 101 as shown in FIG.

  In FIG. 7, the reading reference point is a point that serves as a reference for the database reading unit 107 and the like to start reading content described later when the moved display content area exceeds the reading reference point. State 1 in FIG. 7 is an initial state. State 2 is a state when the display content area has moved. However, state 2 is a state in which the display content area is between two read reference points. State 3 is a state in which a part of the display content area exceeds the readout reference point. At this time, the database reading unit 107 issues a query according to an instruction from the cache content management unit 106 and reads the content from the disk 16 via the database 108. That is, the cache content management unit 106 has (or manages) information about the display content area and the read reference point, and the cache content management unit 106 reads the display content area based on this information. Determine whether the reference point has been exceeded. When the cache content management unit 106 determines that the display content area has exceeded the read reference point, the cache content management unit 106 instructs the database read unit 107 to read the content.

  FIG. 8 is a diagram for explaining an example of requirements for reading content to the background buffer. In FIG. 8, the content in the cache content area indicates the content read into the background buffer. Further, the content in the display content area indicates the content that the display UI unit 101 displays on the display device 15 as shown in FIG. 4 when the display is switched and the background buffer is changed to the current buffer. ing.

  State 1 in FIG. 8 is an initial state. State 2 is a state when the display content area (or reference point) has moved. However, state 2 is a state in which the display content area is in the cache content area. State 3 is a state in which a part of the display content area has gone out of the cache content area. At this time, the database reading unit 107 issues a query according to an instruction from the cache content management unit 106 and reads the content from the disk 16 via the database 108. That is, the cache content management unit 106 has (or manages) information on the display content area and the cache content area. Based on this information, the cache content management unit 106 determines whether or not the display content area exceeds the cache content area. When the cache content management unit 106 determines that the display content area exceeds the cache content area, the cache content management unit 106 instructs the database reading unit 107 to read the content.

  As described above, the requirements differ between the case of reading the content into the current buffer in FIG. 7 and the case of reading out the content into the background buffer in FIG. That is, in FIG. 7, the read reference point is set inside the cache content area. Then, when a part of the display content area exceeds the reading reference point, the database reading unit 107 reads the content into the current buffer. Therefore, the time for starting reading the content in the current buffer is earlier than that in the background buffer. This is because the current buffer is related to the display selection content and responds quickly to the user's change in the display selection content.

(Detailed operation explanation)
Next, the processing operation of the content display device 1 will be described in several cases.
FIG. 9 is a flowchart illustrating an example of content display switching.
First, the display UI unit 101 determines, for example, whether or not an instruction to display content has been given by operating a screen or the like displayed on the display device 15 using the input device 14 or the like (step S801). If it is determined that the display instruction has been given, for example, the display UI unit 101 sets a predetermined arrangement condition in the arrangement condition holding unit corresponding to each buffer (step S802).

Next, the display UI unit 101 sets, in the current buffer information unit 103 via the display data reading unit 102, a buffer used for displaying content first as a current buffer (step S803).
Next, the pointer control unit 104 sets, for example, a content to be displayed at the center of a screen (view) initially displayed on the display device 15 as a display selection content. Then, the pointer control unit 104 sets a display position pointer in the position information unit 105 (step S804).
Next, based on the display position pointer, the pointer control unit 104 sets a reference pointer indicating the reference content of the background buffer corresponding to the content indicated by the display position pointer in the position information unit 105 (step S805).

  Next, the cache content management unit 106 instructs the database reading unit 107 to read the content via the database 108 based on the display position pointer or the reference pointer of the position information unit 105. The database reading unit 107 creates a query based on the instruction from the cache content management unit 106 and the array condition of the array condition holding unit. Subsequently, the database reading unit 107 issues the created query to the database 108, and reads the content from the disc 16 via the database 108. Subsequently, the database reading unit 107 stores the content in each buffer (step S806).

Next, the display data reading unit 102 reads out the content corresponding to the display position pointer stored in the current buffer (step S807).
The display UI unit 101 displays the read content on the display device 15 (step S808).

On the other hand, if it is determined in step S801 that it is not an instruction to display content, the display UI unit 101 determines whether or not the display selection content has been changed by the user (step S809).
If it is determined in step S809 that the display selection content has been changed, the display UI unit 101 advances the process to step S810. In step S810, the pointer control unit 104 moves the display position pointer set in the position information unit 105 so as to point to the changed display selection content.
Next, the pointer control unit 104 moves the reference pointer so as to point to the content corresponding to the display selection content in conjunction with the display position pointer (step S811).

  Next, the display UI unit 101 determines whether there is a change in the content displayed on the display device 15 (step S812). For example, when there is an input operation for changing the display selection content from the content 3 to the content 7 in the view state 301 in FIG. 4, the display UI unit 101 determines that the content to be displayed is changed. If it is determined that there is a change in the content to be displayed, the display UI unit 101 advances the process to step S813. If it is determined that there is no change in the content to be displayed, the display UI unit 101 advances the process to step S819. In step S813, the display data reading unit 102 reads necessary content from the current buffer.

On the other hand, if it is determined in step S809 that the display selection content has not been changed, the display UI unit 101 determines whether or not display switching from the array condition currently selected by the user to a different array condition has been performed. Judgment is made (step S814).
If it is determined that display switching has been performed, the display UI unit 101 sets a buffer corresponding to the switched array condition as a current buffer in the current buffer information unit 103 via the display data reading unit 102 (step S815). ).
Next, the pointer control unit 104 changes the reference pointer indicating the reference content of the designated buffer to the display position pointer and sets it in the position information unit 105 (step S816).

Next, the display data reading unit 102 performs reading from the content indicated by the display position pointer (step S817).
The display UI unit 101 displays the read content on the display device 15 (step S818).
Next, the display UI unit 101 determines whether or not the user's operation via the input device 14 has been completed (step S819).
If it is determined in step S819 that the operation has ended, for example, the display UI unit 101 ends the process shown in FIG. On the other hand, if it is determined in step S819 that the operation has not ended, the display UI unit 101 returns the process to step S809. In step S814, if the display UI unit 101 determines that the display is not switched to a different arrangement condition by the user, the process proceeds to step S819.

  As described above, in the content display switching process according to the present embodiment, even if the display selection content is changed, the content can be quickly displayed on the display device 15 by reading the content from the changed buffer. Even when the display is switched to a different arrangement condition, the display device 15 can be quickly displayed by reading the content corresponding to the display selection content from the switched buffer.

  FIG. 10 is a flowchart illustrating an example of pointer position control when sorting conditions are associated with buffers. Here, as shown in FIG. 3, it is assumed that the buffer 21 stores contents sorted in date order, the buffer 22 in event order, and the buffer 23 in person order. In the initial state, the buffer 21 is assumed to be the current buffer.

First, the display UI unit 101 determines, for example, whether or not a content display instruction has been made by operating the screen displayed on the display device 15 using the input device 14 or the like (step S901).
If it is determined that a display instruction has been given, the display UI unit 101 advances the process to step S902. In step S902, the cache content management unit 106 classifies the buffer based on, for example, a predetermined sort condition (step S902).
Next, for example, the display UI unit 101 sets the sort condition in the array condition holding unit corresponding to each buffer (step S903).

Next, the display UI unit 101 sets the buffer 21 as the current buffer in the current buffer information unit 103 (step S904).
Next, in response to an instruction from the cache content management unit 106, the database reading unit 107 creates a query for reading content from the initial position under the sort conditions held in the array condition holding unit 31. Subsequently, the database reading unit 107 issues the created query, and reads the content from the disc 16 via the database 108. Subsequently, the data reading unit 107 stores the content in the current buffer (step S905).

Then, the pointer control unit 104 sets the position information in the current buffer of the content selected first in the position information unit 105 as the display position pointer in the displayed content (step S906). The pointer control unit 104 may set the position information in the current buffer of the content displayed at the center as the display position pointer.
Next, the pointer control unit 104 sets a reference pointer for the buffer (background buffer) in the position information unit 105 based on the display position pointer (step S907).

  Next, the cache content management unit 106 instructs the database reading unit 107 to read the content via the database 108 based on the reference pointer regarding the background buffer 22 of the position information unit 105. The database reading unit 107 creates a query based on the instruction from the cache content management unit 106 and the sort condition of the array condition holding unit corresponding to the background buffer 22. Subsequently, the database reading unit 107 issues the created query to the database 108, and reads the content from the disc 16 via the database 108. Subsequently, the data reading unit 107 stores the content in the background buffer 22.

Similarly, the cache content management unit 106 instructs the database reading unit 107 to read content via the database 108 based on the reference pointer regarding the background buffer 23 of the position information unit 105. The database reading unit 107 creates a query based on the instruction from the cache content management unit 106 and the sort condition of the array condition holding unit corresponding to the background buffer 23. Subsequently, the database reading unit 107 issues the created query to the database 108, and reads the content from the disc 16 via the database 108. Subsequently, the data reading unit 107 stores the content in the background buffer 23 (step S908).
As a result, the contents of each buffer are as shown in FIG.

On the other hand, if it is determined in step S901 that the instruction is not a content display instruction, the display UI unit 101 determines whether or not the display selection content has been changed by the user (step S909).
If it is determined in step S909 that the display selection content has not been changed, the display UI unit 101 advances the processing to step S917. On the other hand, if it is determined in step S909 that the display selection content has been changed, the display UI unit 101 advances the processing to step S910.
In step S910, the cache content management unit 106 sequentially selects a background buffer (step S910).
The pointer control unit 104 moves the reference pointer related to the background buffer selected by the cache content management unit 106 in conjunction with the display position pointer (step S911).

The cache content management unit 106 determines whether or not the reference content pointed to by the reference pointer is stored in the background buffer (step S912). If it is determined that it is not stored, the cache content management unit 106 advances the process to step S913. If it is determined that it is stored, the cache content management unit 106 advances the process to step S916.
In step S913, the cache content management unit 106 instructs the database reading unit 107 to read the reference content indicated by the reference pointer. Upon receiving this instruction, the database reading unit 107 reads the sort condition of the array condition holding unit corresponding to this background buffer (step S913).
Next, the database reading unit 107 creates a query based on the instruction and the sort information, and issues the created query to the database 108. Subsequently, the database reading unit 107 reads a content group including the reference content from the disc 16 via the database 108 (step S914).
Then, the database reading unit 107 stores the read content in the selected background buffer (step S915).

  Next, the cache content management unit 106 determines whether there is another background buffer (step S916). If it is determined in step S916 that another background buffer exists, the cache content management unit 106 returns the process to step S910. On the other hand, if it is determined in step S916 that no other background buffer exists, the cache content management unit 106 advances the process to step S917.

In step S <b> 917, the display UI unit 101 determines whether or not the user's operation via the input device 14 has been completed.
If it is determined in step S917 that the operation has ended, the display UI unit 101 ends the process illustrated in FIG. On the other hand, if it is determined in step S917 that the operation has not ended, the display UI unit 101 returns to the process of step S909.

  As described above, in switching the display selection content according to the present embodiment, it is determined whether or not the reference content corresponding to the reference pointer is stored in the background buffer. If not stored, the database reading unit 107 reads the content from the database 108. Therefore, the sort buffer content is always stored in the background buffer based on the reference content corresponding to the reference pointer.

  FIG. 11 is a flowchart showing an example of pointer control when group conditions are associated with buffers. Here, as shown in FIG. 6, sorting conditions for single contents in date order are set in the array condition holding unit corresponding to the buffer 21. In the arrangement condition holding unit corresponding to the buffer 22, group conditions for setting single contents as contents grouped every month are set. In the arrangement condition holding unit corresponding to the buffer 23, a group condition is set in which contents grouped for each month in the buffer 22 are grouped contents for each year. In the initial state, the buffer 21 is assumed to be the current buffer.

First, the display UI unit 101 determines, for example, whether or not a content display instruction has been made by operating a screen or the like displayed on the display device 15 using the input device 14 or the like (step S1001).
If it is determined that a display instruction has been given, the display UI unit 101 advances the process to step S1002. In step S1002, the cache content management unit 106 classifies the current buffer based on the sort condition, and classifies the background buffer based on the group condition.
Next, for example, the display UI unit 101 sets the sort condition described above in the array condition holding unit 31 corresponding to the current buffer. In addition, the display UI unit 101 sets the above-described group condition in the arrangement condition holding unit corresponding to the background (step S1003).

Next, the display UI unit 101 sets the buffer 21 as the current buffer in the current buffer information unit 103 (step S1004).
Next, in response to an instruction from the cache content management unit 106, the database reading unit 107 creates a query for reading content from the initial position under the sort conditions held in the array condition holding unit 31. Subsequently, the database reading unit 107 issues the created query to the database 108, and reads content from the disc 16 via the database 108 (step S1005). Subsequently, the data reading unit 107 stores the content read to the current buffer.

Then, for example, the pointer control unit 104 sets the content displayed at the center of the screen (view) displayed first on the display device 15 as the display selection content. Then, the pointer control unit 104 sets the position information of the display selection content pointed to by the display position pointer in the position information unit 105 (step S1006).
Next, based on the display position pointer, the pointer control unit 104 sets a reference pointer indicating the reference content of the background buffer corresponding to the content indicated by the display position pointer in the position information unit 105 (step S1007).
For example, when the content 1 in FIG. 6 is set as the display position pointer, the pointer control unit 104 selects the grouped content 11 to which the content 1 in FIG. 6 belongs or the grouped content 101 to which the content 11 belongs. Use as reference content. Then, the pointer control unit 104 sets the reference pointer so as to point to these reference contents.

  Next, the cache content management unit 106 instructs the database reading unit 107 to read the content via the database 108 based on the reference pointer regarding the background buffer 22 of the position information unit 105. The database reading unit 107 creates a query based on the instruction from the cache content management unit 106 and the group condition of the array condition holding unit corresponding to the background buffer 22. Subsequently, the database reading unit 107 issues the created query to the database 108, and reads the content from the disc 16 via the database 108. Subsequently, the data reading unit 107 stores the content in the background buffer 22 (S1008).

Similarly, the cache content management unit 106 instructs the database reading unit 107 to read content via the database 108 based on the reference pointer regarding the background buffer 23 of the position information unit 105. The database reading unit 107 creates a query based on the instruction from the cache content management unit 106 and the group condition of the array condition holding unit corresponding to the background buffer 23. Subsequently, the database reading unit 107 issues the created query to the database 108, and reads the content from the disc 16 via the database 108. Subsequently, the data reading unit 107 stores the content in the background buffer 23 (step S1008).
As a result, each buffer becomes as shown in FIG.

On the other hand, if it is determined in step S1001 that the instruction is not a content display instruction, the display UI unit 101 determines whether or not the display selection content has been changed by the user (step S1009).
If it is determined in step S1009 that the display selection content has not been changed, the display UI unit 101 advances the process to step S1018. On the other hand, if it is determined in step S1009 that the display selection content has been changed, the display UI unit 101 advances the processing to step S1010.

In step S1010, the cache content management unit 106 sequentially selects a background buffer (step S1010).
The pointer control unit 104 determines whether there is a change (change) in the content corresponding to the content pointed to by the display position pointer in the background buffer selected by the cache content management unit 106 according to the change in the display position pointer. (Step S1011). That is, the pointer control unit 104 determines whether or not to move the reference pointer in accordance with the movement (change) of the display position pointer and the content group information held by the array condition holding unit corresponding to the background buffer. to decide.
When it is determined that there is a change (change) in the content corresponding to the content pointed to by the display position pointer (the content pointed to by the reference pointer needs to be changed) according to the change in the display position pointer, the pointer control unit 104 performs processing. Advances to step S1012. On the other hand, if it is determined that there is no change (change) in the content corresponding to the content pointed to by the display position pointer according to the change in the display position pointer (the content pointed to by the reference pointer need not be changed), the pointer control unit 104 The process proceeds to step S1017.

  In step S1012, the pointer control unit 104 moves the reference pointer so as to point to the corresponding grouped content including the content pointed to by the display position pointer in conjunction with the display position pointer (step S1012).

  Next, the cache content management unit 106 determines whether or not the content pointed to by the reference pointer is stored in the background buffer (step S1013). If it is determined that it is not stored, the cache content management unit 106 advances the process to step S1014. If it is determined that it is stored, the cache content management unit 106 advances the process to step S1017.

In step S1014, the cache content management unit 106 instructs the database reading unit 107 to read the content indicated by the reference pointer. Receiving this instruction, the database reading unit 107 reads the group condition of the array condition holding unit corresponding to the selected background buffer.
The database reading unit 107 creates a query based on the instruction and the read group condition, issues the created query to the database 108, and reads the content from the disc 16 via the database 108 (step S1015).
Then, the database reading unit 107 stores the read content in the selected background buffer (step S1016).

The cache content management unit 106 determines whether there is another background buffer (step S1017).
If it is determined in step S1017 that another background buffer exists, the cache content management unit 106 returns the process to step S1010. On the other hand, if it is determined in step S1017 that no other background buffer exists, the cache content management unit 106 advances the process to step S1018.

In step S1018, the display UI unit 101 determines whether or not the user's operation via the input device 14 is finished.
If it is determined in step S1018 that the operation has ended, the display UI unit 101 ends the process illustrated in FIG. On the other hand, if it is determined in step S1018 that the operation has not ended, the display UI unit 101 returns the process to step S1009.

  As described above, in the display selection content switching according to the present embodiment, it is possible to cope with a grouped content, and it is possible to switch various types of display.

  In the present embodiment, the current buffer is used as the buffer 21 and a single content is stored. However, the buffer 21 may store the grouped content. When the display selection content is changed by the user, the reference pointer is set to the corresponding grouped content for the upper group as described above. In addition, for the lower single content or the lower grouped content, a reference pointer is set to the first content of the arrangement condition in this content.

  FIG. 12 is a flowchart illustrating an example of a processing operation for reading content into the current buffer. Here, as shown in FIG. 7, it is assumed that a predetermined number (two here) of content is displayed before and after the display selection content as a reference.

First, the cache content management unit 106 determines whether or not the current buffer is in an initial state (step S1101).
When determining that the current state is the initial state, the cache content management unit 106 advances the process to step S1102. In step S <b> 1102, the database reading unit 107 reads the array conditions held by the array condition holding unit 31 in response to an instruction from the cache content management unit 106.
Next, the database reading unit 107 creates a query based on the read array conditions. Subsequently, the database reading unit 107 issues the created query to the database 108, and reads the content from the disc 16 via the database 108 (step S1103).
Subsequently, the data reading unit 107 stores the content read to the current buffer (step S1104).

Next, the cache content management unit 106 sets the cache content area shown in FIG. That is, the cache content management unit 106 sets the start point and end point of the content read into the current buffer in the position information unit 105 (step S1105).
Next, the pointer control unit 104 sets a display position pointer in the position information unit 105. Further, the cache content management unit 106 sets the display content area shown in FIG. That is, the cache content management unit 106 sets the start point and end point of the content in the display content area in the position information unit 105 (step S1106).

Next, the cache content management unit 106 sets a read reference point in the cache content area shown in FIG. That is, the cache content management unit 106 sets the start point and end point of the content at the read reference point in the position information unit 105 (step S1107).
On the other hand, if it is determined in step S1101 that the current state is not the initial state, the cache content management unit 106 advances the process to step S1107. For example, when the buffer is designated by switching the display and becomes the current buffer, the content is stored in the current buffer, so the cache content management unit 106 determines that it is not in the initial state.

Next, the display UI unit 101 determines whether or not the display selection content has been changed by the user (step S1108). If it is determined in step S1108 that the display content has not been changed, the display UI unit 101 advances the process to step S1117. On the other hand, if it is determined in step S1108 that the display content has been changed, the process proceeds to step S1109.
In step S1109, the cache content management unit 106 moves the display content area in accordance with the movement of the display position pointer. The cache content management unit 106 sets the position information of the moved display content area (the start point and end point of the content in the display content area) in the position information unit 105.

  Next, the cache content management unit 106 determines whether the display content area has exceeded the read reference point based on the position information set in the position information unit 105, for example, as shown in state 3 in FIG. (Step S1110). If it is determined in step S1110 that the read reference point has not been exceeded, the cache content management unit 106 advances the processing to step S1117. If it is determined in step S1110 that the read reference point has been exceeded, the cache content management unit 106 advances the process to step S1111.

In step S <b> 1111, the database reading unit 107 reads the array condition held in the array condition holding unit 31 in response to an instruction from the cache content management unit 106 (step S <b> 1111).
Then, the data reading unit 107 creates a query based on the read array condition, issues the created query to the database 108, and reads the content from the disk 16 via the database 108 (step S1112).
Subsequently, the data reading unit 107 stores the content read to the current buffer (step S1113).

Next, the cache content management unit 106 moves the cache content area and changes the start point and end point of the content read into the current buffer (step S1114).
Further, the cache content management unit 106 changes the read reference point so as to correspond to the changed cache content area (step S1115).

Next, the cache content management unit 106 deletes the content outside the cache content area remaining in the current buffer (step S1116).
Next, the display UI unit 101 determines whether the display has been switched to a different arrangement condition by the user (step S1117).
If it is determined in step S1117 that display switching has not been performed, the display UI unit 101 returns the process to step S1108. On the other hand, if it is determined in step S1117 that the display has been switched, the display UI unit 101 ends the process illustrated in FIG.

  As described above, according to the present embodiment, when the display content area exceeds the read reference point, the content is read to the current buffer. Therefore, the content can be quickly displayed by pre-reading before all the content to be displayed on the display device 15 disappears in the current buffer. Note that by setting the read reference point close to the display content area, the prefetch interval can be made fine.

  FIG. 13 is a flowchart illustrating an example of a processing operation for reading content into the background buffer. Here, as shown in FIG. 8, it is assumed that two contents are held in the background buffer based on the contents corresponding to the reference pointer.

First, the cache content management unit 106 determines whether or not the background buffer is in an initial state (step S1201).
When determining that the current state is the initial state, the cache content management unit 106 advances the process to step S1202. In step S1202, the database reading unit 107 reads the array condition (or sort condition) held in the array condition holding unit 32 in response to an instruction from the cache content management unit 106 (step S1202). Here, for simplification of description, the description will be made on the assumption that the arrangement condition of the arrangement condition holding unit 32 is read out, but this does not limit the implementation of the present invention.
Next, the database reading unit 107 creates a query based on the array conditions held in the read array condition holding unit 32. Subsequently, the database reading unit 107 issues the created query to the database 108, and reads content from the disc 16 via the database 108 (step S1203).
Subsequently, the data reading unit 107 stores the content in the background buffer 22 (step S1204).

Next, the cache content management unit 106 sets the cache content area shown in FIG. That is, the cache content management unit 106 sets the start point and end point of the content read in the background buffer in the position information unit 105 (step S1205).
Next, the pointer control unit 104 sets a reference pointer in the position information unit 105. Further, the cache content management unit 106 sets the display content area shown in FIG. That is, the cache content management unit 106 sets the start point and end point of the content in the display content area in the position information unit 105 (step S1206).
On the other hand, if it is determined in step S1201 that the current state is not the initial state, the cache content management unit 106 advances the process to step S1207. For example, when the current buffer becomes a background buffer by switching the display to a different arrangement condition, since the content is stored in the background buffer, the cache content management unit 106 determines that it is not in the initial state. To do.

Next, the cache content management unit 106 determines whether or not the reference pointer has been moved by the pointer control unit 104 (step S1207).
When determining that the reference pointer has not been moved, the cache content management unit 106 advances the processing to step S1215. On the other hand, when determining that the reference pointer has been moved, the cache content management unit 106 advances the processing to step S1208.

  In step S1208, the cache content management unit 106 moves the display content area as the reference pointer moves. The cache content management unit 106 sets the position information of the moved display content area (the start point and end point of the content in the display content area) in the position information unit 105.

  Next, the cache content management unit 106 determines whether or not the display content area has exceeded the cache content area based on the position information set in the position information unit 105, for example, as shown in state 3 of FIG. (Step S1209). If it is determined in step S1209 that the cache content area has not been exceeded, the cache content management unit 106 advances the process to step S1215. If it is determined in step S1209 that the cache content area has been exceeded, the cache content management unit 106 proceeds to step S1210.

In step S1210, the database reading unit 107 reads the array condition held in the array condition holding unit 32 in response to an instruction from the cache content management unit 106 (step S1210).
Then, the data reading unit 107 creates a query based on the read array condition, issues the created query to the database 108, and reads content from the disk 16 via the database 108 (step S1211).
Subsequently, the data reading unit 107 stores the content read to the background buffer (step S1212).

  Next, the cache content management unit 106 moves the cache content area and changes the start point and end point of the content read in the background buffer (step S1213).

Next, the cache content management unit 106 deletes the content outside the cache content area remaining in the background buffer (step S1214).
Next, the display UI unit 101 determines whether or not display switching to a different arrangement condition has been performed by the user (step S1215).
If it is determined in step S1215 that display switching has not been performed, the display UI unit 101 returns the process to step S1207. On the other hand, if it is determined in step S1215 that the display has been switched, the display UI unit 101 ends the process illustrated in FIG.

  Thus, according to the present embodiment, when the display content area exceeds the cache content area, the content is read out to the background buffer. Therefore, even if the display is switched to a different arrangement condition by the user and the display is switched from the current buffer to the background buffer, the content can be displayed quickly.

  As described above, according to the present invention, it is possible to quickly display content even if the content arrangement conditions are switched and displayed.

  In the present embodiment, only the display of content has been described. However, a thumbnail or metadata of the content may be displayed.

  In the present embodiment, different methods are used for reading content into the current buffer in step S1110 in FIG. 12 and reading content in the background buffer in step S1209 in FIG. However, when reading content to the background buffer, a method of reading content to the current buffer may be used. In this case, it is possible to quickly display the content immediately after switching the display or even if the display selection content is changed.

  Further, in this embodiment, the buffer setting based on the sort condition and the buffer setting based on the group condition are performed. However, these can be mixed. Further, in the buffer setting based on the group condition, different sort conditions can be set and combined for each group. This makes it possible to switch more various displays.

  The temporary storage device includes a case where one storage device is divided into a plurality of storage areas.

As described above, according to the present embodiment, it is possible to switch the display at high speed based on the content selected for display with a small amount of buffer memory. Further, even when the content selected for display is changed, the content corresponding to this can be prefetched, and the display can be switched.
Further, depending on the display switching condition, the same content as the content selected for display can be used as a reference, or the related content can be used as a reference, and more types of display can be switched.
Also, not only the content selected for display but also the content around it can be prefetched according to the display state, and when displaying the list by switching the arrangement order, the surrounding content can be displayed at high speed. it can.
Further, even when the content arrangement conditions are switched and displayed, the content can be displayed quickly.

(Other embodiments)
Each means constituting the content display device and each step of the content display method in the above-described embodiment can be realized by operating a program stored in a RAM, a ROM, or the like of a computer. This program and a computer-readable recording medium on which the program is recorded are included in the present invention.

  In addition, the present invention can be implemented as, for example, a system, apparatus, method, program, or recording medium, and may be applied to a system including a plurality of devices.

  The present invention supplies a software program for realizing the functions of the above-described embodiments directly or remotely to a system or apparatus. In addition, this includes a case where the system or the computer of the apparatus is also achieved by reading and executing the supplied program code.

  Accordingly, since the functions of the present invention are implemented by computer, the program code installed in the computer also implements the present invention. In other words, the present invention includes a computer program itself for realizing the functional processing of the present invention. In that case, as long as it has the function of a program, it may be in the form of object code, a program executed by an interpreter, script data supplied to the OS, and the like.

  Further, the functions of the above-described embodiments are realized by the computer executing the read program. Furthermore, based on the instructions of the program, an OS or the like running on the computer performs part or all of the actual processing, and the functions of the above-described embodiments can be realized by the processing.

  As another method, a program read from a recording medium is first written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. Then, based on the instructions of the program, the CPU or the like provided in the function expansion board or function expansion unit performs part or all of the actual processing, and the functions of the above-described embodiments are also realized by the processing.

It is a figure which shows an example of the hardware constitutions of a content display apparatus. It is a figure which shows an example of a structure of a content display apparatus. It is a figure which shows an example of the pointer of the content arranged for every sort condition in each buffer. It is a figure which shows an example of the content displayed on a display apparatus. It is a figure which shows an example of the content displayed on a display apparatus. It is a figure which shows an example of the pointer of the data arranged for every group condition within each buffer. It is a figure which shows the example for demonstrating the case where a content is read to a current buffer. It is a figure which shows the example for demonstrating the case where a content is read to a background buffer. 6 is a flowchart illustrating an example of content display switching. It is a flowchart which shows an example of the position control of the pointer in the case of making a sort condition respond | correspond to a buffer. It is a flowchart which shows an example of the position control of the pointer when making a group condition respond | correspond to a buffer. It is a flowchart which shows an example of the processing operation which reads a content to a current buffer. It is a flowchart which shows an example of the processing operation which reads a content to a background buffer.

Explanation of symbols

11 CPU
12 ROM
13 RAM
DESCRIPTION OF SYMBOLS 14 Input device 15 Display device 16 Disk 21 Buffer 22 Buffer 23 Buffer 31 Array condition holding | maintenance part 32 Array condition holding | maintenance part 33 Array condition holding | maintenance part 101 Display UI part 102 Display data reading part 103 Current buffer information part 104 Pointer control part 105 Position information Unit 106 cache content management unit 107 database reading unit 108 database

Claims (14)

Content storage means for acquiring the content stored in the storage device according to the arrangement condition set for each temporary storage device, and storing the content in each temporary storage device;
Based on the selected arrangement condition, reading means for reading the content stored in the corresponding temporary storage device;
Display control means for displaying the content read by the reading means on a display device;
Display content indicating the selected content stored in the temporary storage device corresponding to the selected arrangement condition when the selected content selected by the user among the content displayed on the display device is changed The content information is moved according to the change, and the reference content information corresponding to the selected content and indicating a reference content in a temporary storage device different from the temporary storage device is moved according to the change. Content information control means,
A content display device comprising: If the array condition is changed,
The content information control means changes the reference content information related to the temporary storage device corresponding to the changed arrangement condition to the display selection content information,
The content display device according to claim 1, wherein the reading unit reads content from the temporary storage device based on the changed display selection content information.   In a case where the content indicated by the reference content information is not stored in the different temporary storage device, the content storage means includes the content including the content indicated by the reference content information according to the arrangement condition set in the temporary storage device The content display device according to claim 1, wherein a group is acquired from the storage device and stored in the temporary storage device.   When the arrangement condition set for each temporary storage device has a group relationship, the content information control means moves the display selection content information according to the change, and the change and the group information of the content. Whether or not the reference content information is to be moved, and when it is determined that the reference content information is to be moved, the reference content information is moved in accordance with the change and the group information of the content. The content display device according to any one of claims 1 to 3. Along with the movement of the display selection content information, the display content area indicating the area related to the content displayed on the display device is moved in the area of the temporary storage device, and the display content area is moved to the temporary storage device. Content management means for determining whether or not the reference point set by
5. The content storage unit according to claim 1, wherein the content management unit reads the content from the storage device when the content management unit determines that the display content area exceeds the reference point. The content display device described in 1. Along with the movement of the reference content information, a display content area indicating an area related to the content corresponding to the content displayed on the display device is moved in the area of the temporary storage device, and the display content area is temporarily stored. It further has content management means for judging whether or not the area for storing the content of the device has been exceeded,
5. The content storage unit reads content from the storage device when the content management unit determines that the display content area exceeds the area for storing the content. 6. The content display device according to claim 1. A content display method in a content display device,
A content storage step of acquiring the content stored in the storage device according to the arrangement condition set for each temporary storage device, and storing the content in each temporary storage device;
A reading step of reading the content stored in the corresponding temporary storage device based on the selected arrangement condition;
A display control step of displaying the content read in the reading step on a display device;
Display content indicating the selected content stored in the temporary storage device corresponding to the selected arrangement condition when the selected content selected by the user among the content displayed on the display device is changed The content information is moved according to the change, and the reference content information corresponding to the selected content and indicating a reference content in a temporary storage device different from the temporary storage device is moved according to the change. Content information control step to be
A content display method characterized by comprising: If the array condition is changed,
In the content information control step, the reference content information related to the temporary storage device corresponding to the changed arrangement condition is changed to the display selection content information,
8. The content display method according to claim 7, wherein in the reading step, content is read from the temporary storage device based on the changed display selection content information.   When the content indicated by the reference content information is not stored in the different temporary storage device, in the content storage step, the content including the content indicated by the reference content information according to the arrangement condition set in the temporary storage device The content display method according to claim 7 or 8, wherein a group is acquired from the storage device and stored in the temporary storage device.   When the arrangement condition set for each temporary storage device has a group relationship, in the content information control step, the display selection content information is moved according to the change, and the change and the group information of the content Whether or not the reference content information is to be moved, and when it is determined that the reference content information is to be moved, the reference content information is moved in accordance with the change and the group information of the content. The content display method according to any one of claims 7 to 9. Along with the movement of the display selection content information, the display content area indicating the area related to the content displayed on the display device is moved in the area of the temporary storage device, and the display content area is moved to the temporary storage device. And a content management step for determining whether or not the reference point set in step 1 is exceeded,
The content storage step reads content from the storage device when it is determined in the content management step that the display content area exceeds the reference point. The content display method described in 1. Along with the movement of the reference content information, a display content area indicating an area related to content corresponding to the content displayed on the display device is moved in the area of the temporary storage device, and the display content area is temporarily stored. A content management step of determining whether or not the content storage area of the device has been exceeded;
The content storage step reads content from the storage device when it is determined in the content management step that the display content area exceeds the area for storing the content. The content display method according to claim 1. Computer
Content storage means for acquiring the content stored in the storage device according to the arrangement condition set for each temporary storage device, and storing the content in each temporary storage device;
Based on the selected arrangement condition, reading means for reading the content stored in the corresponding temporary storage device;
Display control means for displaying the content read by the reading means on a display device;
Display content indicating the selected content stored in the temporary storage device corresponding to the selected arrangement condition when the selected content selected by the user among the content displayed on the display device is changed The content information is moved according to the change, and the reference content information corresponding to the selected content and indicating a reference content in a temporary storage device different from the temporary storage device is moved according to the change. Content information control means,
Program to make it function.   A computer-readable recording medium storing the program according to claim 13.

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