JP5639962B2 - Search system - Google Patents

Description

  The present invention relates to a technique for setting content search menu items based on content browsing results by keyword search.

  Patent Document 1 “Data Drill-down Method” has “There is no fixed order in approach to database search, for example, to realize a free search process that can be drilled down by applying it to a business strategy system”. "A method for extracting searchable items and how to use the information, and a procedure for enabling drill-down in search processing" is disclosed.

  In general, an operator needs to set menu items to be selected in a drill-down menu in advance. Alternatively, the user needs to set it intentionally.

  However, the term that the operator selects as the menu item is not necessarily the term that the viewer generally uses. If the term of the menu item does not match the viewer's feeling, the intended search is not performed.

  In many cases, the user may find it cumbersome to determine and set the menu item by himself. Furthermore, if terms are not standardized, similar terms may be confused as menu items. As described above, it is not always easy to assign menu items suitable for documents shared by many users.

Japanese Patent Laid-Open No. 9-311862

  It is an object of the present invention to construct a menu suitable for the viewer's sense by registering, as a menu item, a keyword used for searching when the viewer reaches the content.

The search system according to the present invention is:
A search system that can be connected to a user terminal, and has the following elements: (1) an index database that stores an index used for searching the content for each content; and (2) from the user terminal A search request receiving unit that receives a search request to which a search condition can be added (3) It is configured to prompt a user to input a keyword search condition on the user terminal and to return a search request with the input keyword search condition added. Furthermore, in accordance with the keyword search condition added to the received search request, the content is searched from the index of the index database, and a list of searched content is displayed in a selectable state for each content on the user terminal, Search screen generation that generates a search screen configured to send back a request to display the selected content (4) A search screen transmission unit that returns the generated search screen to the user terminal that transmitted the search request. (5) A display request reception unit that receives a content display request from the user terminal. A content selection history generation unit (7) that generates a content selection history that identifies a keyword that was a search condition when searching a list including the content and associates the identified keyword with the content. Content selection history storage unit for storing history (8) A menu item extraction unit that extracts a combination of a keyword and content from a content selection history and sets the keyword to a menu item included in the index of the content.

Also,
Further, the search screen generation unit prompts the user to select a menu item on the user terminal, returns a search request to which a search condition of the selected menu item is added, and further adds the menu item added to the received search request. The content is searched from the index of the index database in accordance with the search conditions, the searched content list is displayed in a selectable state for each content on the user terminal, and the display request for the selected content is returned. The search screen is configured.

Also,
The menu item extraction unit extracts the combination of the keyword and the content based on the appearance frequency of the combination of the keyword and the content included in the content selection history storage unit.

Also,
The appearance frequency is a number of appearances of a combination of a keyword and a content in the content selection history storage unit.

Also,
The appearance frequency is an appearance ratio of a combination of a keyword and a content in the content selection history storage unit.

Also,
The appearance frequency is an appearance ratio obtained by dividing the number of appearances of a combination of a keyword and content in the content selection history storage unit by the number of appearances of the content in the content selection history storage unit.

Also,
The appearance frequency is an appearance ratio obtained by dividing the number of appearances of a combination of a keyword and a content in the content selection history storage unit by the number of appearances of the keyword in the content selection history storage unit.

Also,
The search screen generation unit configures a search screen to add a keyword search condition keyword added to the received search request to the content display request and send it back,
The content selection history generation unit uses a keyword added to a content display request as the identified keyword.

Also,
The content selection history generation unit specifies a keyword of a search condition added to a search request by the same user terminal as the user terminal that transmitted the content display request, and uses the keyword as the specified keyword.

Also,
For each content, the index database stores the location of the content,
The search system further
(9) A content display screen generating unit that acquires a location corresponding to the content of the received content display request from the index database, and generates a content display screen for accessing the acquired location;
(10) It has a content display screen transmission part which returns the produced | generated content display screen to the user terminal which transmitted the display request of the said content.

The program according to the present invention is:
Each content has an index database for storing an index used for searching the content, and causes a computer to be a search system connectable to a user terminal to execute the following procedure (1) Search request reception procedure for receiving a search request to which a search condition can be added from the user terminal (2) The user terminal is prompted to input a keyword search condition and a search request with the input keyword search condition added is returned. In addition, the content is searched from the index of the index database according to the keyword search condition added to the received search request, and a list of searched content can be selected for each content on the user terminal. A search screen configured to display and return a request to display the selected content Search screen generation procedure to be performed (3) Search screen transmission procedure for returning the generated search screen to the user terminal that transmitted the search request (4) Display request reception procedure for receiving a content display request from the user terminal ( 5) A content selection history generation procedure for specifying a keyword that was a search condition when searching a list including the content for the requested content, and generating a content selection history in which the identified keyword is associated with the content. 6) Content selection history storage procedure for storing the generated content selection history (7) Extracting a combination of a keyword and content from the content selection history, and extracting a menu item for setting the keyword in a menu item included in the index of the content procedure.

  For the content selected from the content list and requested to be displayed, the keyword when the list including the content is searched is specified and the keyword is adopted as a menu item. Therefore, in the subsequent search, drill-down search (menu search) In this example, it is possible to reach valid contents simply by selecting the menu item.

  Since the viewer relies on the fact that the content is determined to be meaningful from the list, the effectiveness as a menu item is high. Since it is automatically registered, the labor of registering menu items for the operator and user is reduced.

  In addition, since the appearance frequency in the selected history is determined according to a predetermined standard and the height of the relation between the content and the keyword is ensured, the menu items with low effectiveness can be prevented from being mixed up.

It is a figure which shows the network which concerns on this invention. It is a figure which shows the data flow which concerns on a search and content display. It is a figure which shows a search screen. It is a figure which shows a search processing flow. It is a figure which shows the structure of the search server which concerns on an initial response process. It is a figure which shows an initial response processing flow. It is a figure which shows an index database. It is a figure which shows a drill-down search area production | generation process flow. It is a figure which shows the structure of the search server which concerns on a keyword search corresponding | compatible process. It is a figure which shows a keyword search corresponding | compatible process flow. It is a figure which shows a search result list production | generation processing flow. It is a figure which shows the structure of the search server which concerns on a content delivery process. It is a figure which shows a content delivery processing flow. It is a figure which shows a content selection log | history (the 1). It is a figure which shows a content selection log | history (the 2). It is a figure which shows the structure of the search server which concerns on a menu item extraction process. It is a figure which shows a menu item extraction process flow. It is a figure which shows appearance frequency calculation processing flow (the 1). It is a figure which shows appearance frequency calculation processing flow (the 2). It is a figure which shows an appearance frequency calculation process flow (the 3). It is a figure which shows appearance frequency calculation processing flow (the 4). It is a figure which shows the structure of the search server which concerns on a menu search corresponding | compatible process. It is a figure which shows a menu search corresponding | compatible process flow. 6 is a diagram illustrating a network configuration according to Embodiment 2. FIG. It is a figure which shows the structure of the content management server which concerns on Embodiment 2. FIG. It is a figure which shows the structure of the search server which concerns on Embodiment 2. FIG. It is a figure which shows the menu item extraction process flow which concerns on Embodiment 2. FIG.

  FIG. 1 is a diagram showing a network according to the present invention. The search server 101, the WEB site server 102, and the user terminal 103 are connected via the Internet. The search server 101 searches the contents of the WEB site server 102 using the index. The user terminal 103 uses the content search service of the search server 101 to access the WEB site server 102 having the searched content. The user terminal 103 includes a browser. In this example, the search server 101 constitutes a search system.

  FIG. 2 is a diagram showing a data flow related to search and content display. A search request is transmitted from the user terminal 103 to the search server 101 (access to the search URL), and the search server 101 returns an initial search screen to the user terminal 103. When a keyword is input from the user terminal 103 and a search is instructed, a search request is transmitted to the search server 101 (access to a search URL to which the keyword is added as a parameter). The search server 101 searches the content including the keyword and returns a search screen including the search result to the user terminal 103. When content is selected from the search result at the user terminal 103, content selection is transmitted to the search server 101 (accessed to the selected URL with the content ID and keyword added as parameters). The search server 101 returns a content display screen for displaying the selected content. The content display screen is configured to access the WEB site URL. The user terminal 103 displays a content display screen, accesses the WEB site URL, and displays the WEB site screen of the WEB site server 102.

  FIG. 3 shows a search screen. On the left is the drill-down search area. The upper right is the keyword search area. The lower right is the search result list display area. The drill-down search area is an area for displaying a drill-down menu. For each menu, the menu items included in the menu are displayed in a state in which an instruction operation (clicking) is possible. The number of contents corresponding to the menu item is added to the menu item. In the search result list display area, the content title of the searched content is displayed in a state where it can be instructed (clicked), and the head part (predetermined number of characters range) of the content body is displayed.

  When a keyword is input and transmission is instructed, the keyword input to the URL of the search request is added as a search condition for access. When a menu item is selected, the selected menu item (menu item ID or character code of the menu item name) is added to the URL of the search request as a search condition for access.

  FIG. 4 is a diagram showing a search processing flow. The search request is accepted (S401), and the search condition added to the search request is determined (S402). The search request is the URL of the search server 101, and the search condition is added as a URL parameter. If no search condition is added to the search request, an initial response process (S403) is performed. If a keyword search condition is added to the search request, keyword search handling processing (S404) is performed. If a search condition for the menu item is added to the search request, a menu search handling process (S405) is performed.

  First, the initial response process (S403) will be described. FIG. 5 is a diagram illustrating the configuration of the search server according to the initial handling process. The search server 101 includes a search request reception unit 501, a search screen generation unit 502, an initial search screen storage unit 503, a drill-down search area generation unit 504, an index database 505, and a search screen transmission unit 506. The search request receiving unit 501 is configured to receive a search request.

  FIG. 6 is a diagram showing an initial response processing flow. The search screen generation unit 502 acquires the initial search screen from the initial search screen storage unit 503 in the initial search screen acquisition process (S601). In the initial search screen, the menu of the drill-down search area is not set. In addition, the content list of the search result list display area is not set. Subsequently, the drill-down search area generation unit 504 sets a menu in the drill-down search area based on the index database 505 in the drill-down search area generation process (S602). The search screen transmission unit 506 returns the generated search screen to the user terminal 103 (S603).

  FIG. 7 shows an index database. The index database can be generated by a general crawling process of a crawler unit (not shown). The crawling result may be acquired from the outside. Each content of the WEB site server 102 has a record for associating a content ID, a title, a body text, a first menu item (keyword), a second menu item (field), and a location field. The content ID is a code assigned for content identification. The title is the title of the content and is acquired from the content. Body text, the main text of the content, obtained from the content. A menu item is set for each menu of the drill-down search. In this example, the first menu is a keyword, and the keyword of the content is set as the first menu item. The second menu is a field, and the field of the content is set as the second menu item. The menu item can be set by an operator of the search server 101 or set by a user of the user terminal 103. The location is a storage position for accessing the content. The URL of the WEB site is set.

  The drill-down search area generation process (S602) will be described in detail. FIG. 8 is a diagram showing a drill-down search area generation processing flow. The following processing is repeated for each menu (S801). A menu item included in the menu is specified (S802). The menu items of the index group in the index database 505 are read, and the menu items are specified sequentially without duplication and omission. Then, for each menu item, the number of contents including the menu item is counted (S803). When all the menus are processed (S804), the menu names are first arranged (S806) for each menu again (S805). Subsequently, the menu items are sorted in descending order of the number of contents (S807), and the menu item name and the number of contents are arranged for each menu item according to the order (S808). Further, a search request URL pointing to the search server 102 is set as a link destination to be accessed when the menu item is instructed (clicked) on the browser. A menu item (information that can identify a menu item such as a menu item name or menu item number) is added as a parameter to the search request URL (S809). When all the menus have been processed, the process ends (S810).

  Next, the keyword search handling process (S404) will be described. FIG. 9 is a diagram illustrating a configuration of a search server according to the keyword search support process. The search server 101 includes a search request receiving unit 501, a search screen generation unit 502, an initial search screen storage unit 503, an index database 505, a drill-down search area generation unit 504, a search screen transmission unit 506, a keyword search unit 901, and a search A result display area generation unit 902 is provided.

  FIG. 10 is a diagram showing a keyword search support processing flow. The search screen generation unit 502 acquires the initial search screen from the initial search screen storage unit 503 in the initial search screen acquisition process (S1001). Subsequently, the keyword search unit 901 performs a search using the keyword as a condition in the keyword search process (S1002). A content including a search condition keyword in the title or body text is searched, and the ID of the searched content is specified. The search result display area generation unit 902 generates a search result display area (S1003), and sets a content list in the search result display area.

  FIG. 11 is a diagram showing a search result list generation processing flow. The following processing is repeated for each searched content (S1101). First, the title corresponding to the content ID is read and placed in the title area of the content in the search result display area (S1102), and the title is instructed to be selected. A search URL + keyword + content ID is set in the link destination (S1103). The keyword and the content ID are added as URL parameters, respectively. Further, the body text corresponding to the content ID is read and placed in the body text area of the content in the search result display area (S1104). These processes are repeated until the limit on the number of display contents is reached (S1105).

  Subsequently, drill-down search area generation processing (S1004) by the drill-down search area 504 is performed. This is as described above. Then, the search screen generated from the search screen transmission unit 506 is returned to the user terminal 103 (S1005).

  When the user terminal 103 is instructed to select content from the content list of the search result list, the search server 101 delivers a display screen of the content. FIG. 12 is a diagram illustrating a configuration of a search server related to content distribution processing. In addition to the index database 505, the search server 101 includes a display request receiving unit 1201, a content selection history generation unit 1202, a content selection history storage unit 1203, a content display screen generation unit 1204, and a content display screen transmission unit 1205. .

  FIG. 13 is a diagram showing a content distribution processing flow. When the display request reception unit 1201 receives a display request (S1301), first, the content selection history generation unit 1202 generates a content selection history (S1302). Subsequently, the content display screen generation unit 1204 generates a content display screen (S1303), and returns the content display screen to the user terminal 103 that has transmitted the content selection (S1304).

  An example of a content selection history is shown. FIG. 14 is a diagram showing a content selection history (part 1). In this example, a record for associating fields of a keyword 1401, a content ID 1402, and an access date 1403 is provided for each content selection. The content selection history generation unit 1202 identifies the current date and current time, and stores them in the content selection history storage unit 1203 as access dates in addition to the keyword and content ID received by the display request reception unit 1201. .

  FIG. 15 is a diagram showing a content selection history (part 2). In this example, a field for content location 1402 is provided instead of the content ID. The content selection history generation unit 1202 acquires a location corresponding to the received content ID from the index database 505. Then, the current date and the current time are specified, and these are stored as access dates in the content selection history storage unit 1203 in addition to the keyword and content location pair received by the display request receiving unit 1201.

  In this embodiment, the content selection history generation unit 1202 uses a keyword added to the content selection received by the display request reception unit 1201. However, regardless of this method, the user terminal 103 is specified by a login process or a cookie. If a keyword can be specified in accordance with a control sequence including communication, the keyword may be used. When the search server 101 can specify a keyword selected as a condition in the previous keyword search by the search request of the user terminal 103 that has selected the content and transmitted the display request, for example, the content included in the search screen based on the most recent keyword search In the method of controlling to invalidate other than the display request, the keyword used by the keyword search unit 901 in the most recent keyword search can be used for the content selection history.

  Next, menu item extraction processing will be described. FIG. 16 is a diagram illustrating a configuration of a search server according to the menu item extraction process. The search server 101 includes a menu item extraction unit 1601 in addition to the index database 505 and the content selection history storage unit 1203.

  FIG. 17 is a diagram showing a menu item extraction process flow. The menu item extraction unit 1601 repeats the following processing for each combination of keyword and content ID (location) (S1701). The appearance frequency of the combination is calculated (S1702), and when the appearance frequency satisfies the reference value (S1703), the record of the content ID (location) is specified in the index database 505 (S1704), and the keyword is assigned to the record. Is registered as a menu item of the menu corresponding to the browsing result (S1705). When all the combinations have been processed, the process ends (S1706).

  An example of appearance frequency calculation is shown. FIG. 18 is a diagram illustrating an appearance frequency calculation processing flow (part 1). First, the search range to be calculated is specified (S1801). For example, a predetermined number of history records are targeted. Alternatively, a history record included in an access date / time included in a predetermined length period is targeted. The entire history may be targeted. Then, the number of appearances of the combination in the range is calculated (S1802). Let the number of appearances be the appearance frequency.

  FIG. 19 is a diagram illustrating an appearance frequency calculation processing flow (part 2). In this example, the total number of histories in the search range to be calculated is calculated (S1901), and the number of appearances of the combination in the range is calculated (S1902). Then, a quotient (appearance ratio) obtained by dividing the number of appearances of the combination by the total number of histories is set as the appearance frequency (S1903).

  FIG. 20 is a diagram showing an appearance frequency calculation processing flow (part 3). In this example, the number of appearances of the keyword in the search range to be calculated is calculated (S2001), and the number of appearances of the combination in the range is calculated (S2002). Then, a quotient (appearance ratio) obtained by dividing the combination appearance count by the keyword appearance count is set as the appearance frequency (S2003).

  FIG. 21 is a diagram showing an appearance frequency calculation processing flow (part 4). In this example, the number of appearances of the content ID (location) in the search range to be calculated is calculated (S2101), and the number of appearances of the combination in the range is calculated (S2102). Then, a quotient (appearance ratio) obtained by dividing the number of appearances of the combination by the number of appearances of the content ID (location) is set as the appearance frequency (S2103).

  The menu search handling process (S405 in FIG. 4) using these menu items will be described. FIG. 22 is a diagram illustrating a configuration of a search server according to the menu search handling process. A menu search unit 2201 is included.

FIG. 23 is a diagram showing a menu search handling process flow. The search screen generation unit 502 acquires the initial search screen from the initial search screen storage unit 503 in the initial search screen acquisition process (S2301). Subsequently, the menu search unit 2201 performs a search using a menu item as a condition in the menu search process (S2302). A content including a menu item that matches the condition is searched for in the index of the index database 505, and the ID of the searched content is specified. The search result display area generation unit 902 generates a search result display area (S2303), and sets a content list in the search result display area. In the same manner as described above, drill-down search area generation processing (S2304) by the drill-down search area 504 and search screen transmission processing (S2305) by the search screen transmission unit 506 are performed.

Embodiment 2. FIG.
In addition to the search server 101, a content management server 104 may be provided so that menu items can be extracted on the content management server 104 side. In this embodiment, the search server 101 and the content management server 104 constitute a search system.

  FIG. 24 is a diagram illustrating a network configuration according to the second embodiment. The search server 101 and the content management server 104 are connected by a system network (for example, LAN) in the search system. The search server 101 and the content management server 104 are connected to the Internet via a search system network (for example, a LAN).

  FIG. 25 is a diagram illustrating a configuration of a content management server according to the second embodiment. The content management server 104 includes a content selection history acquisition unit 2501, a content selection history storage unit 2502, a menu item extraction unit 2503, and a menu item registration request transmission unit 2504.

  FIG. 26 is a diagram illustrating a configuration of the search server according to the second embodiment. The search server 101 includes a content selection history transmission unit 2601 and a menu item registration request reception unit 2602 in addition to the index database 505 and the content selection history storage unit 1203.

  A content selection history request is transmitted from the content selection history acquisition unit 2501 of the content management server 104 to the search server 101. When receiving the content selection history request, the search server 101 2601 reads a history record group including a keyword, a content ID (location), and an access date and time from the content selection history storage unit 1203, and uses the content management server 104 as a content selection history. Reply to

  When the content selection history acquisition unit 2501 of the content management server 104 receives the content selection history, the content selection history storage unit 2502 stores the content selection history. The menu item extraction unit 2503 extracts a combination of a content ID (location) and a menu item.

  FIG. 27 is a diagram showing a menu item extraction processing flow according to the second embodiment. The menu item extraction unit 2503 repeats the following process for each combination of keyword and content ID (location) (S2701). As described above, the appearance frequency of the combination is calculated (S2702), and when the appearance frequency satisfies the reference value (S2703), the combination of the content ID (location) and the menu item is specified using the keyword as a menu item. (S2506). The process ends when all combinations are processed (S2505).

  The menu item registration request transmission unit 2504 of the content management server 104 transmits a combination group of these content IDs (locations) and menu items to the search server 101 as a menu item registration request.

  The menu item registration request receiving unit 2602 of the search server 101 receives the combination group of the content ID (location) and the menu item, specifies the index record including the content ID (location) from the index database 505 for each combination, and The menu item is registered in the menu item of the record browsing record.

Embodiment 3 FIG.
In the above example, the content of the WEB site server 102 on the Internet is the search target, but the content stored in the content management server 104 can also be the target.

  Either the first embodiment or the second embodiment is suitable for the menu item extraction method. The location of the index database 505 indicates the content storage position of the content management server 104.

  The search server 101, the WEB site server 102, the user terminal 103, and the content management server 104 are computers, and each element can execute processing by a program. Further, the program can be stored in a storage medium so that the computer can read the program from the storage medium.

DESCRIPTION OF SYMBOLS 101 Search server 102 WEB site server 103 User terminal 104 Content management server 501 Search request reception part 502 Search screen production | generation part 503 Initial search screen memory | storage part 504 Drill-down search area generation part 505 Index database 506 Search screen transmission part 901 Keyword search part 902 Search result display area generation unit 1201 Display request reception unit 1202 Content selection history generation unit 1203 Content selection history storage unit 1204 Content display screen generation unit 1205 Content display screen transmission unit 1601 Menu item extraction unit 2201 Menu search unit 2501 Content selection history reception Unit 2502 content selection history storage unit 2503 menu item extraction unit 2504 menu item registration request transmission unit 2601 content selection history transmission unit 2 02 menu item registration request receiving unit

Claims (11)

A search system that can be connected to a user terminal and has the following elements: (1) An index database that stores an index used for searching the content for each content (2) User A search request receiving unit that receives a search request to which a search condition can be added from the terminal (3) The user is prompted to input a keyword search condition on the user terminal, and the search request with the input keyword search condition is returned. Further, content is searched from the index of the index database in accordance with the keyword search condition added to the received search request, and a list of searched content is displayed in a selectable state for each content on the user terminal. And generate a search screen configured to send back a request to display the selected content Search screen generation unit (4) Search screen transmission unit that returns the generated search screen to the user terminal that transmitted the search request (5) Display request reception unit (6) that receives a content display request from the user terminal A content selection history generation unit (7) that identifies a keyword that is a search condition when a list including the content is searched for the requested content, and generates a content selection history that associates the identified keyword with the content. A content selection history storage unit that stores the generated content selection history (8) A menu item extraction unit that extracts a combination of a keyword and a content from the content selection history and sets the keyword in a menu item included in the index of the content.   Further, the search screen generation unit prompts the user to select a menu item on the user terminal, returns a search request to which a search condition of the selected menu item is added, and further adds the menu item added to the received search request. The content is searched from the index of the index database in accordance with the search conditions, the searched content list is displayed in a selectable state for each content on the user terminal, and the display request for the selected content is returned. The search system according to claim 1, wherein a search screen is configured.   The search system according to claim 2, wherein the menu item extraction unit extracts the combination of the keyword and the content based on the appearance frequency of the combination of the keyword and the content included in the content selection history storage unit.   The search system according to claim 3, wherein the appearance frequency is the number of appearances of a combination of a keyword and a content in a content selection history storage unit.   The search system according to claim 3, wherein the appearance frequency is an appearance ratio of a combination of a keyword and content in a content selection history storage unit.   The appearance frequency is an appearance ratio obtained by dividing the number of appearances of a combination of a keyword and a content in the content selection history storage unit by the number of appearances of the content in the content selection history storage unit. Search system.   The appearance frequency is an appearance ratio obtained by dividing the number of appearances of a combination of a keyword and a content in the content selection history storage unit by the number of appearances of the keyword in the content selection history storage unit. Search system. The search screen generation unit configures a search screen to add a keyword search condition keyword added to the received search request to the content display request and send it back,
The search system according to claim 2, wherein the content selection history generation unit uses a keyword added to a content display request as the specified keyword.   The content selection history generation unit specifies a keyword of a search condition added to a search request by the same user terminal as the user terminal that transmitted the content display request, and uses the keyword as the specified keyword. Item 8. The search system according to any one of Items 2 to 7. For each content, the index database stores the location of the content,
The search system further
(9) A content display screen generating unit that acquires a location corresponding to the content of the received content display request from the index database, and generates a content display screen for accessing the acquired location;
(10) The search system according to any one of claims 1 to 9, further comprising: a content display screen transmission unit that returns the generated content display screen to the user terminal that has transmitted the content display request. A program that has an index database for storing an index used for searching the content for each content, and causes a computer to be a search system connectable to the user terminal to execute the following procedure (1) User terminal Search request reception procedure for receiving a search request to which a search condition can be added (2) A configuration in which the user terminal is prompted to input a keyword search condition and a search request to which the input keyword search condition is added is returned. Further, content is searched from the index of the index database in accordance with the keyword search condition added to the received search request, and a list of searched content is displayed in a selectable state for each content on the user terminal. A search screen configured to send back a request to display the selected content Search screen generation procedure to be performed (3) Search screen transmission procedure for returning the generated search screen to the user terminal that transmitted the search request (4) Display request reception procedure for receiving a content display request from the user terminal ( 5) A content selection history generation procedure for specifying a keyword that was a search condition when searching a list including the content for the requested content, and generating a content selection history in which the identified keyword is associated with the content. 6) Content selection history storage procedure for storing the generated content selection history (7) Extracting a combination of a keyword and content from the content selection history, and extracting a menu item for setting the keyword in a menu item included in the index of the content procedure.

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