JP4034503B2 - Document search system and document search method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a document search system such as a natural language search system and a document search method used in the search system.
[0002]
[Prior art]
Conventionally, a keyword search system is well known as a document search method. This keyword search system searches for a document including a keyword input by a user. In order to search for a target document using this system, the user needs to specify an appropriate keyword included in the target document. In this case, especially when there are a large number of documents in the database, a large number of candidate documents can be obtained simply by specifying a single keyword. Therefore, the user further refines the candidates by additionally inputting keywords. A refined search is required.
[0003]
As a system using such a search method, a full-text search system for searching for a document file required by a user from a large number of document files has been developed. In this document search system, in order to narrow down search candidates, the user needs to connect several words with “or”, “and”, or “not”, create a search expression, and search accordingly. .
[0004]
Therefore, recently, a natural language search system capable of efficiently searching registered document data with daily words (natural language) has been developed. In a natural language search system, just by inputting a question sentence (query) in everyday language (natural language), the query content analysis, syntax analysis, morpheme analysis, keyword weighting, and similarity calculation are performed automatically. Thus, an appropriate document can be easily retrieved from the database.
[0005]
Such a natural language search system requires advanced document analysis processing. Therefore, the search target document file is analyzed in advance to generate search data corresponding thereto, and the search data is registered in the database. It is necessary to keep it.
[0006]
[Problems to be solved by the invention]
However, even if a natural language search system is used, since the search is performed on a word basis, it is difficult to search for related documents written in the same theme with each other. ) And repeated searches many times.
[0007]
The present invention has been made in view of the above-described circumstances, and it is possible to easily create and register a link collection for referring to a related registered document by using a list of search results, and the relation registered in the database. An object of the present invention is to provide a document search system and a document search method capable of searching a document all at once.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problem, the present invention provides a database provided in a server computer connected to a client computer via a network in accordance with a keyword or a question sentence input from the client computer. in the document retrieval system for searching a document file is registered, searching for document files registered in the database as a keyword or question inputted from the client computer, the list of the search results clients create a means for presenting to the computer, the links including the document file respective identification information selected as the destination document by a client computer from the list of the search results, the the links database Using the links created and registration means for registering as a single document file, the links registered in the database by the Links creation and registration means, for searching the linked documents registered in the database The linked document search means, and searches the database for a document file corresponding to the keyword or question sentence according to the keyword or question sentence input from the client computer, the searched document file, the keyword or A link that presents a link collection including a title or comment corresponding to a question sentence and a link collection including identification information designating the searched document file as a link destination document together as a list of search results to the client computer. especially in that it comprises a collection retrieval means To.
[0009]
This document search system has a function to create a collection of links. Simply select the corresponding document file from the list of search results for registered documents searched according to the entered keyword or question text. A collection of links including link destination information corresponding to each selected document file is created and registered in the database. By using this collection of links, it is possible to search all the related documents registered in the database without repeating the search by keywords or question sentences many times. In particular, the link collection can also be easily searched by registering it in the database as one of the normal search target document files. When searching for a document file, a document file searched from the database according to a keyword or a question sentence and a collection of links that specify the document file as a link destination document are presented together as a list of search results. Therefore, it is possible to efficiently search not only a normal document file but also a collection of links.
[0010]
In addition, by analyzing a document file selected as a link destination document from the list of search results and using the analysis result as a keyword or a question sentence, a document file related to the selected document file is stored in the database. It is preferable to further provide related document search means for performing a search from the list and additionally presenting a list of related document files as candidates for the link destination document. By providing such a related document search means, even if a document that is not included in the search result list of registered documents searched according to the keyword or question text entered by the user is searched and linked. It becomes possible to add to the candidates for the previous document.
[0011]
Instead of or in addition to the related document search means, the document file registered in the database is re-searched according to the newly input keyword or question sentence, and a list of the re-search results is displayed as the linked document. Re-search means for additionally presenting as candidates may be used.
[0012]
The link collection is registered in the database as one of the document files to be searched, and only the link collection is searched from the document files registered in the database, and a list of the link collection is displayed. It is desirable to provide means for presenting. As a result, the link collection can be searched and used in the same manner as the document file, and the target document can be referred to from the list of link collections without inputting a keyword or a question sentence.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a configuration of a client server type computer system to which a document search system according to an embodiment of the present invention is applied. As shown in the figure, this computer system includes a server computer 11 and a plurality of client computers 12. Server computer 11 and client computer 12 are connected via a computer network such as a LAN or the Internet.
[0015]
As shown in the figure, the server computer 11 is provided with a natural language search system 111, an HTTP server 112, and the like. The natural language search system 111 is a search system capable of efficiently searching a pre-registered document file with daily words (natural language), and a query sentence with daily words (natural language) from the client computer 12. (Query) is analyzed, and further processing such as syntax analysis, morphological analysis, keyword weighting processing, similarity calculation, and the like is performed to search for an appropriate document from registered documents. The natural language search system 111 includes a search server 201, a search engine 202, and a database 203.
[0016]
The database 203 stores document files registered as search targets and search data (index data) corresponding thereto. The search engine 202 is a software module for performing the above-described processing for natural language search, and by using the search data in the database 203, registration that matches the condition specified by the question sentence or input keyword in the natural language. Search for documents. The search server 201 is a software module for providing a search service to the client computer 12 through the HTTP server 112, and includes a link collection management unit 201a that manages the link collection, which is a feature of the present embodiment.
[0017]
The link collection is a set of link destination information for each of the documents related to each other among the registered documents registered in the database 203, and is registered in the database 203 as one of the normal search target documents. The link collection management unit 201a is for performing processing related to creation, registration, search, and the like of the link collection, and manages the link destination information for the ID and the link destination document for each created link collection. By managing the ID of each link collection in the link collection management unit 201a, it is possible to classify whether a document registered as a search target document file in the database 203 is a normal document or a link collection.
[0018]
The user of each client computer 12 can access the server computer 11 through the Web browser 121 to search a document file, create / search a link collection, and the like.
[0019]
FIG. 2 schematically shows an example of the data structure of the link collection.
As described above, the link collection is a kind of document file, and includes “title”, “comment”, “link destination information”, and the like. “Title” is a headline of the corresponding link collection, and “comment” is document information that briefly describes the contents of the link collection. “Link destination information” is a set of links to document files (here, document files A, B, and C) to be referred to as link destination documents, and is composed of ID groups of document files to be referred to. .
[0020]
(Creation / registration of links)
Next, the link collection creation function provided by the search server 201 will be described.
The link collection creation / registration function is a support function that allows a user to easily create a link collection on the web browser 121 and register it in the database 203, and is provided to the web browser 121 by the search server 201. By selecting the “Create link collection” function on the Web page, a procedure for that is executed.
[0021]
In this case, first, the search server 201 provides the Web browser 121 with a screen for creating a collection of links, and the processing proceeds according to the operation on the screen. Here, a series of processing for link collection creation / registration will be described with reference to the flowchart of FIG. 3 and display screen examples of FIGS. 4 and 5.
[0022]
First, the client computer 12 inputs a title of the link collection, a comment, and a creator, and also inputs a question sentence (natural sentence) or a keyword in a natural language. Link candidates are searched (step S101). The link collection title, comment, creator input operation, and natural sentence or keyword input operation are performed on the screen of FIG.
[0023]
That is, the screen of FIG. 4 is a link collection creation screen that is displayed when the “link collection creation” button is pressed on the Web page that is first provided by the search server 201. A group of input fields for titles, comments, and creators corresponding to the link collection, a question sentence in natural language, and keywords are provided. The input field of “Title” is for registering the title of the link collection, and the character string “Link Collection:” is automatically inserted at the head of the input title. The “comment” input field is used for registering a comment for the link collection, and the “creator” input field is used for registering the creator name of the link collection.
[0024]
When a question sentence or keyword is input in the “question sentence” or “keyword” input field and the “search” button is pressed, the information is sent to the search server 201 and the database 201 is searched. Then, a list of search results is returned from the search server 201 to the Web browser 121.
[0025]
Next, the client computer 12 performs a selection operation of a document file to be registered in the link collection as a link destination document from the search result list display screen displayed on the Web browser 121 (step S102). A display example of the search result list display screen is shown in FIG. On the list display screen, as shown in the figure, the headings of the retrieved document files are displayed in order of score. The score indicates the degree of coincidence with the “question sentence” or “keyword”, and here, the score is displayed with the number of stars and%. A check box as shown in the figure is provided next to the heading of each document file. By checking this, a document file to be registered in the link collection can be selected.
[0026]
Next, in accordance with the operation on the search result list display screen of FIG. 5, it is determined which of registration / re-search / related document search is to be performed (step S103). When the “Register” button on the search result list display screen of FIG. 5 is pressed, a link collection including the currently selected document file (the document file checked by the check) as a link destination document is created, and this is a database. It is automatically registered in 203 (step S104). In this case, morphological analysis is performed on the titles and comments of the link collection, and search index data necessary for the search of the link collection is created based on the result and registered in the database 203. In addition, the ID of each selected document file is generated as link destination information, which is managed by the link collection management unit 201a together with the ID of the link collection.
[0027]
When a “re-search” button is pressed in a state where a new question text or keyword is entered in the question text / keyword input field on the search result list display screen of FIG. 5, the registration document of the new question text or keyword is registered. The re-search is executed, and the search result is additionally displayed as a link destination document candidate on the search result list display screen of FIG. 5 (step S105). In this re-search process, the document file already checked in step S102 is left on the search result list screen as it is, and instead of the unchecked document file list, the document file newly searched by the re-search is stored. A list is displayed.
[0028]
Further, when the “Related Search” button on the search result list screen in FIG. 5 is pressed, a document file related to the currently selected document file (the document file checked by the check) is searched from the database 203. A related document search process for additionally displaying as a link destination document candidate on the search result list screen is executed (step S106). Even in this case, document files that have already been checked are left as they are on the search result list screen, and a list of newly searched document files is displayed instead of a list of unchecked document files. . In the related document search process, search index data corresponding to each currently selected document file is read from the database 203, and a new question sentence or keyword is automatically generated using the search index data. The search by the question sentence or the keyword is executed. This makes it possible to search for related documents similar to the document selected as the link destination candidate and present it as a link destination candidate.
[0029]
In this way, after the re-search process or the related document search process is performed, the document file selection process in step S102 is performed again. When the “Register” button is pressed, a link collection including the document files selected up to that point is created as a link destination document and registered in the database 203 (step S104).
[0030]
(List of links)
Next, a link collection list display function for displaying a list of link collections registered in the database 203 will be described.
[0031]
This link collection list display function searches only the link collection from the documents registered in the database 203 and provides the list to the requesting client computer 12 instead of a normal document file search by a question sentence or a keyword. That's it. The link collection list display function service is activated by, for example, pressing a “link collection” button on the screen of FIG. Hereinafter, a series of processing related to the link list display will be described with reference to the flowchart of FIG. 6 and display screen examples of FIGS. 7 and 8.
[0032]
First, when the “link collection” button is pressed, the search of the link collection from the database 203 is performed by the search server 201 based on the ID of each registered link collection, and the link collection obtained by the search is searched. The list is displayed on the requesting Web browser 121 (step S201). FIG. 7 shows an example of a screen for displaying the link list.
[0033]
As shown in FIG. 7, on the link collection list display screen, the titles, creator names, and comments for each of all the link collections registered in the database 203 are displayed side by side. At the top of the title, a character string “link collection:” added at the time of creating the link collection is additionally displayed.
[0034]
When a title of a certain link collection is selected on the link collection list display screen (step S202), the text (title, creator name, document ID, comment) of the selected link collection and link destination information are displayed. It is provided from the search server 201 to the requesting Web browser 121, and is displayed by the Web browser 121 as shown in FIG. 8 (step S203). FIG. 8 shows a display example when a link collection having the title “Link collection; recommendation of knowledge management” is selected. In the link destination information display area, a list of titles of the link destination documents is displayed. When a title of a certain linked document is selected on this screen (step S204), the text of the selected document is provided from the search server 201 to the requesting Web browser 121, which is the Web browser 121. Is displayed on the screen (step S205).
[0035]
(Search links)
Next, a process for searching a link collection from the database 203 using keywords and question sentences as in the case of a normal document will be described.
[0036]
As described above, the search data obtained by analyzing the title and comment of the link collection is registered in the database 203. However, it is not possible to obtain a sufficient hit rate by itself. Leakage may occur. Therefore, in this system, there is provided a mechanism for searching for a linked document having the ID of a normal document searched from the database 203 as a link destination information by a keyword and a question sentence, and providing it as a search result list. . Hereinafter, a series of processing for link collection search will be described with reference to a flowchart of FIG. 9 and a display screen example of FIG.
[0037]
First, the client computer 12 inputs a question sentence or a keyword, and a process of searching for a corresponding document from registered documents in the database 203 based on the question sentence or the keyword is performed (step S301). Next, a search for a link collection having the searched document as a link destination is performed (step S302), and a search result list includes a document searched by a question sentence or a keyword and a link collection specifying the document as a link destination document. Are provided together with the requesting Web browser 121 and displayed on the screen by the Web browser 121 (step S303). An example of this display screen is shown in FIG.
[0038]
FIG. 10 shows a case where a link collection having the title “link collection; recommendation of knowledge management” is searched in addition to a normal document searched by a question sentence or a keyword. This collection of links includes at least one of the retrieved normal documents as a link destination document.
[0039]
When a certain link collection is selected on the search result list display screen of FIG. 10 (step S304), the text (title, creator name, document ID, comment) and link destination information of the selected link collection are displayed. The search server 201 provides the request to the Web browser 121, which is displayed by the Web browser 121 as described with reference to FIG. 8 (step S305). Then, by selecting the title of the target document from the documents specified by the link destination information on the screen (step S306), the text of the selected document can be displayed on the screen by the Web browser 121. Yes (step S307).
[0040]
As described above, in the document search system according to the present embodiment, the selected document can be selected simply by selecting the corresponding document from the search result list of registered documents searched according to the input keyword or question sentence. A link collection including link destination information corresponding to each can be automatically created and registered in the database 203. In addition, since it is possible to search and refer to linked documents using the registered link collection, related documents registered in the database 203 can be retrieved without repeating a search using a keyword or a question sentence many times. It will be possible to search all at once.
[0041]
In the above description, the case where the document search system of the present embodiment is applied to a client-server type computer system has been described as an example. However, the document search system can be similarly applied to a stand-alone computer. .
[0042]
In addition, since the natural language search system 111 according to the present embodiment is realized by a computer program, the computer program is stored in a computer-readable storage medium so that the computer program can be transferred to a normal computer through the storage medium. The effect similar to that of the present embodiment can be obtained only by introduction. The computer program can be distributed not only via a storage medium but also via a communication medium.
[0043]
Further, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the column of the effect of the invention Can be obtained as an invention.
[0044]
【The invention's effect】
As described above, according to the present invention, a collection of links for referring to related registered documents can be easily created and registered using a list of search results, and related documents registered in the database are stored once. It is possible to search without any leaks. In particular, the link collection can be easily searched by registering the link collection in the database as one of ordinary documents.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a client server type computer system to which a document search system according to an embodiment of the present invention is applied.
FIG. 2 is a diagram for explaining a data structure of a link collection used in the embodiment.
FIG. 3 is an exemplary flowchart illustrating a procedure of link collection creation processing which is executed in the embodiment;
FIG. 4 is an exemplary view showing a first display screen provided in the link collection creating process of the embodiment.
FIG. 5 is an exemplary view showing a second display screen provided in the link collection creation process of the embodiment.
FIG. 6 is an exemplary flowchart showing the procedure of a link collection list display process which is executed in the embodiment;
FIG. 7 is an exemplary view showing a first display screen provided in a link collection list display process executed in the embodiment.
FIG. 8 is an exemplary view showing a second display screen provided in the link collection list display process executed in the embodiment.
FIG. 9 is an exemplary flowchart illustrating a procedure of link collection search processing which is executed in the embodiment;
FIG. 10 is an exemplary view showing a display screen provided in the link collection search process of the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Server computer 12 ... Client computer 111 ... Natural language search system 112 ... HTTP server 121 ... Web browser 201 ... Search server 202 ... Search engine 203 ... Database 201a ... Link collection management part

Claims (8)

A server computer connected via a network to a client computer, in response to a keyword or question inputted from the client computer, the document retrieval to search for a document file that the registered in the database provided in the server computer In the system,
Means for searching a document file registered in the database according to a keyword or a question sentence input from the client computer, and presenting a list of search results to the client computer ;
A link collection that includes identification information of each document file selected as a link destination document by the client computer from the search result list and registers the link collection as one of the document files in the database. Creation / registration means,
Link destination document search means for searching for a link destination document registered in the database using the link collection registered in the database by the link collection creation / registration means ;
A document file corresponding to the keyword or question sentence is searched from the database according to a keyword or question sentence input from the client computer, and the searched document file and a title or a title corresponding to the keyword or question sentence A link collection search means for presenting a link collection including a comment and a link collection including identification information for specifying the searched document file as a link destination document to the client computer together with a list of search results; A document retrieval system characterized by that. By analyzing the document file selected as the link destination document by the client computer, and using the analysis result as a keyword or a question sentence, the document file related to the selected document file is searched from the database, 2. The document search system according to claim 1, further comprising related document search means for additionally presenting a list of related document files as link destination document candidates to the client computer . The document file registered in the database is re-searched in accordance with a keyword or question sentence newly input from the client computer, and a list of the re-search results is additionally presented to the client computer as linked document candidates. 2. The document retrieval system according to claim 1, further comprising retrieval means. 2. The document retrieval system according to claim 1, further comprising means for retrieving only a link collection from the document files registered in the database and presenting a list of the link collection to the client computer. . A document search in which a server computer connected to a client computer via a network searches a document file registered in a database provided in the server computer according to a keyword or a question sentence input from the client computer In the method
The server computer searching a document file registered in the database according to a keyword or a question sentence input from the client computer, and presenting a list of search results to the client computer;
The server computer creates a link collection including identification information of each document file selected as a link destination document by the client computer from the list of search results, and stores the link collection in the database as one of the document files. Link collection creation / registration step to register as,
A link destination document search step in which the server computer searches for a link destination document registered in the database using a link collection registered in the database;
The server computer searches the database for a document file corresponding to the keyword or question sentence according to the keyword or question sentence input from the client computer, and the retrieved document file and the keyword or question sentence Links containing titles or comments corresponding to the A document search method comprising: a link collection search step of presenting a link collection including identification information designated as a link destination document together with a list of search results to the client computer. 6. The document search according to claim 5, further comprising a step in which the server computer searches only the link collection from the document files registered in the database and presents a list of the link collection. Method. To cause a server computer connected to a client computer via a network to execute a search for a document file registered in a database provided in the server computer in accordance with a keyword or a question sentence input from the client computer A computer-readable storage medium storing a computer program of
The computer program is
A procedure for searching a document file registered in the database according to a keyword or a question sentence input from the client computer, and presenting a list of search results to the client computer;
A link collection that includes identification information of each document file selected as a link destination document by the client computer from the search result list and registers the link collection as one of the document files in the database. Creation and registration procedures,
A link destination document search procedure for searching for link destination documents registered in the database using the link collection registered in the database;
A document file corresponding to the keyword or question sentence is searched from the database according to a keyword or question sentence input from the client computer, and the searched document file and a title or a title corresponding to the keyword or question sentence A link collection search procedure for presenting a link collection including a comment and a link collection including identification information designating the searched document file as a link destination document to the client computer together as a list of search results; A storage medium that is executed by a computer. The computer program is
8. The storage medium according to claim 7, further causing the server computer to further execute a procedure of searching only a link collection from document files registered in the database and presenting a list of the link collection.

Images