JP2009258869A - Document evaluation device and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To evaluate an evaluation target document by eliciting a user's potential requirement to a document inherent in a retrieval history. <P>SOLUTION: An information sharing support system 10 estimates shared value by use of contents of the evaluation target document, similarity with contents of a shared retrieval document, the number of hits and adaptability with the past retrieval history, and use frequency information of a similar document, and presents value imparted to the other users by the information/document to the user to motivate disclosure. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technique for evaluating a document, and in particular, evaluates the shared value of a document.

  There are systems that use information usage and search history to facilitate information sharing.

  In the information sharing support method of Patent Document 1, information to be requested is registered as shared information in a question sentence format, thereby informing what information other members are seeking. In addition, it maintains a search history that is obtained by converting the query text for shared information into a search expression, matches new search history with past search history, and presents highly relevant search query text. The user who has searched in the past is notified by selecting which question sentence corresponds to. In addition, it is intended to avoid registration of duplicate information by searching and presenting shared information that has already been registered when the title is input.

  In the information sharing support method of Patent Document 2, the user who refers to the published information inputs the evaluation information as to whether it is valid, and the public information of the referrer who has evaluated it as the basis for evaluating it as valid. By associating and registering, and providing feedback to the registrant of public information, it is possible to share information by knowing how public information is used.

  Both methods of Patent Document 1 and Patent Document 2 determine the value of information sharing by assigning evaluation information to information that has already been registered as public (shared) information, and are still registered. It does not evaluate the information that is not. Therefore, since it is not known whether it was really requested unless it is made public, there is a possibility that it will not be used even if it is made public, and it may even lose motivation for sharing.

Note that the above-described prior art and its problems are described only to explain a part of the background of the present invention. It should be noted that the present invention is not limited to the above-described prior art and problems.
JP-A-10-222521 JP 2005-222131 A

  The present invention has been made in consideration of the above-described circumstances, and an object thereof is to provide a document evaluation technique for evaluating the shared value of an unregistered document.

  According to this invention, in order to achieve the above-mentioned object, the configuration as described in the claims is adopted. Here, prior to describing the invention in detail, supplementary explanations of the claims will be given.

  That is, according to the first aspect of the present invention, the document evaluation apparatus includes: search target document storage means for storing the search target document group; and search for the search target document group stored in the search target document storage means. A search history storage means for holding a search history searched by the search means; a document input means for inputting an evaluation target document; and generating a search expression from the evaluation target document input by the document input means A search expression generating means for extracting a search history similar to the search expression from the search history holding means using a search expression generated from the evaluation target document; and generated from the evaluation target document The search target document is searched by the search means using the search formula. The evaluation based on the number of search target documents specified by the search performed on the search group and the search history extracted by the search history extraction means for the search expression generated from the evaluation target document. An evaluation unit that evaluates the target document; a display unit that displays an evaluation result of the evaluation unit; a setting unit that selectively shares and sets the evaluation target document in accordance with a user operation; If the number of search target documents specified by the search performed on the search target document group by the search means using the search formula generated from the evaluation target document is smaller than a predetermined value N1, the first It is evaluated that there is a shared value of the type; by the search means using the search expression generated from the document to be evaluated The number of search target documents specified by the search executed on the search target document group is N1 or more and smaller than a predetermined value N2 (where N2> N1), and is generated from the evaluation target document. When a predetermined usage rate of a search target document included in each search result of one or a plurality of search histories extracted by the search history extraction unit with respect to the search formula is M1 or more, the second type of sharing The number of search target documents specified by the search performed on the search target document group by the search means using the search formula generated from the evaluation target document is N1 or more, In addition, it is smaller than a predetermined value N3 (where N3> N1), and for the search expression generated from the evaluation target document If the predetermined usage rate of the search target document included in each search result of one or a plurality of search histories extracted by the search history extraction means does not exceed M2 (where M2 ≦ M1), the third The type of shared value is evaluated; and the display means displays the type of shared value.

  According to the invention of claim 2, in the invention of claim 1, the N2 and the N3 are equal, and the M1 and the M2 are equal.

  According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, the predetermined usage rate of the search target document included in each search result of the 1 or the search history is the search history. The maximum access number of the search target documents included in the search results is set to be the maximum value.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, the evaluation means uses the search expression generated from the evaluation target document and the search target document group by the search means. The number of search target documents specified by the search executed for N is not less than N1 and smaller than a predetermined value N4 (where N4> N1), and for the search formula generated from the evaluation target document No search history extracted by the search history extraction means, and a search specified by a search performed on the search target document group by the search means using a search expression generated from the evaluation target document When the predetermined access count (average access count) of the target document is less than or equal to the predetermined threshold access count, the fourth type It is to be evaluated and is worth.

  According to a sixth aspect of the invention, in any one of the first to fifth aspects of the invention, the evaluation means includes a search history of a search performed for a predetermined period from the current time of the evaluation target document. Number of search histories searched for search histories of a search formula generated from the evaluation target document for the search formula as a search target by the search history extraction means during the predetermined period from the current time Is evaluated as having the fifth type of shared value when the number is equal to or greater than a predetermined number.

  According to the invention of claim 7, the computer includes: a search target document storage means for storing the search target document group; a search means for searching the search target document group stored in the search target document storage means. Search history holding means for holding the search history searched by the search means; document input means for inputting the evaluation target document; search expression generation means for generating a search expression from the evaluation target document input by the document input means; Search history extraction means for extracting a search history similar to the search expression from the search history holding means using the search expression generated from the evaluation target document; the search using the search expression generated from the evaluation target document; Executed on the search target document group by means Evaluation means for evaluating the evaluation target document based on the number of search target documents specified by the search and the search history extracted by the search history extraction means for the search expression generated from the evaluation target document; Display means for displaying an evaluation result of the evaluation means; function as setting means for selectively sharing and setting the evaluation target document according to a user operation; and the evaluation means is generated from the evaluation target document When the number of search target documents specified by the search executed on the search target document group by the search means using a search formula is smaller than a predetermined value N1, it is evaluated that there is a first type of shared value. And using the search formula generated from the evaluation target document, the search means performs the search target document. The number of search target documents specified by the search executed for the comment group is N1 or more and smaller than a predetermined value N2 (where N2> N1), and the search formula generated from the evaluation target document is On the other hand, when the predetermined usage rate of the search target document included in each search result of one or a plurality of search histories extracted by the search history extraction means is M1 or more, there is a second type of shared value. The number of search target documents specified by the search performed on the search target document group by the search means using the search formula generated from the evaluation target document is N1 or more and a predetermined value The search history is extracted with respect to a search expression that is smaller than the value N3 (where N3> N1) and is generated from the document to be evaluated. If the predetermined usage rate of the search target document included in each search result of one or a plurality of search histories extracted by the means does not exceed M2 (where M2 ≦ M1), the third type of shared value The display means implements a document evaluation program for displaying the shared value type.

  These and other aspects of the invention are set forth in the appended claims and will be described in detail below with reference to examples.

  According to the inventions of claims 1 to 4 and claim 7, the first type, i.e., the shared value as a new document, the second type, i.e., as a popular document, for the document to be evaluated. The shared value and the third type, i.e. the shared value as the desired document, can be evaluated.

  Further, according to the invention of claim 5, it is possible to evaluate the fourth type, that is, the shared value as a document which is not popular but is not obsolete.

  Further, according to the invention of claim 6, it is possible to evaluate the shared value of the fifth type, that is, the trend document.

  Hereinafter, an embodiment in which the document evaluation technique of the present invention is applied to an information sharing support system will be described.

  FIG. 1 shows an information sharing support system 10 according to an embodiment of the present invention as a whole. The information sharing support system 10 typically includes a server system 20, user terminals 30, 40, and the like. The server system 20 and the user terminals 30 and 40 are connected by a communication network 60. The communication network 60 performs well-known message communication, for example, mail communication, FTP, and HTTP communication between entities. Only one user terminal 30, 40 is shown, but there may be a plurality of user terminals. The user terminals 30 and 40 are typically personal computers, but various other information terminals can be employed. A predetermined computer program is installed in the server system 20 and the user terminals 30 and 40, and each functional unit of the information sharing support system 10 is realized by cooperating hardware resources and software of each computer.

  The information sharing support system 10 according to this embodiment includes the information / document contents created and viewed by the user, the similarity to the contents of the already shared document, the degree of compatibility with the past search history, and Estimate shared value by using the number of hits and usage frequency information of similar documents, present the value of the information / document to other users, and enhance motivation for information sharing To do. In addition, the amount and quality of shared information can be maintained by suppressing the disclosure of information / documents that are not used even if they are disclosed.

  The information sharing support system 10 of this embodiment includes a document database 201 and a search history database 202 that stores a search history for the document database 201.

  As a search operation to the document database 201, the user inputs a keyword and designates a document to be a search key. The information sharing support system 10 generates a search expression for search from the input keyword and document content, and searches the document database 201. The documents registered in the document database 201 are pre-indexed, and the documents are searched based on the degree of matching with the keyword expressed as a search expression.

  The search result search expression (a set of keywords), the number of search hits, and information on the utilization rate of the search result document are registered in the search history database 202 together with the user information and date information that have been searched. Here, for example, the average access count of documents included in the search result is used as the utilization rate (see the search history table in FIG. 5).

  In addition, the document database 201 has a function of holding the number of information referred (accessed) to each registered document (see the document information table in FIG. 4).

  Furthermore, an Example is described in detail.

  In FIG. 1, the server system 20 receives a search request from the user terminal 40 and returns a search result. The server system 20 evaluates the document in response to the document input from the user terminal 30 and performs public registration (sharing) of the document based on the evaluation.

  The server system 20 includes a document database 201, a search history database 202, a document registration unit 203, a search expression generation unit 204, a document search unit 205, a history registration unit 206, a history search unit 207, a shared value determination unit 208, and the like. Is done.

  The user terminal 30 includes a document input unit 301, a shared value display unit 302, a sharing instruction unit 303, and the like.

  The user terminal 40 includes a search instruction unit 401, a search result display unit 402, and the like.

  In FIG. 1, the user terminal 40 issues a search request to a document managed by the server system 20, acquires the result, and the user terminal 30 uses the search history or the like to search for an evaluation target document. Although the request for evaluation is shown to the server system 20 and will be described below in accordance with this, the user terminals 30 and 40 can be replaced, and each of the user terminals 30 and 40 All these operations may be realized.

  In the information sharing support system 10, the search instruction unit 401 of the user terminal 40 transmits a search request to the server system 20. For example, the search instruction unit 401 inputs one or a plurality of keywords in an input form, or inputs an identifier of a document to be a search base, or specifies a document to be a search base from a list of documents. Is supplied to the search expression generation unit 204 of the server system 20.

  The document database 201 holds a document information table as shown in FIG. 4, and records a document ID (document ID), the number of accesses, an index, and the like in this document information table. The index information is a pair of word entry and goodness-of-fit (weight), but may include other attributes such as the appearance position in the document. Actually, the document ID, the matching degree, etc. are held for each word entry in the index table as index information. The fitness (weight) may be constrained to 1 or zero. The entity of the document may be held in the document database 201 or stored in another document management unit.

  The search expression generation unit 204 generates a search expression from the keyword. When a document identifier is specified instead of a keyword, the corresponding document is sent to the search expression generation unit 204, and a combination of keywords and matching degrees (typically word vectors) is generated. The word vector may be generated by a known method, for example, the tf · idf method.

  The document search unit 205 refers to the document information table stored in the document database 201 to determine the degree of matching between the search formula and each document, and uses a list of documents that are equal to or higher than the predetermined level as a search result. To the search result display unit 402 of the person terminal 40. The user of the user terminal 40 can access the document by specifying the document (document identifier) in the search result list. The goodness of fit is typically determined by an inner product of vectors, but the weights of these documents may be accumulated in consideration of only the documents that are significant (high weight) in the index.

  The document search history executed by the document search unit 205 is registered in the search history database 202 by the history registration unit 206. For example, as shown in FIG. 5, the search history database 202 includes a time stamp at the time of search for each document search history ID, a user ID of the user who requested the search, a search expression (keyword), the number of hits (the number of hit documents). Number), keep the utilization rate. The utilization rate is typically the average number of accesses at that time of the hit document, but a value calculated by other statistical processing may be used. The number of accesses to the document that is the basis of the utilization rate can be acquired from the document information table of FIG. In this example, the usage rate of the document hit in the search is a snapshot at the time of the search, but the usage rate of the document may be dynamically calculated from the number of accesses of the document at each time point.

  The user of the user terminal 30 sends a document evaluation request to the server system 20. The evaluation request can be made by designating a document identifier (file name, URL) or the like on an input form, for example. The document input unit 301 supplies the designated document body to the search expression generation unit 204 of the server system 20. The search expression generation unit 204 typically generates a word vector from the input document.

  The document search unit 205 searches for a document registered in the document database 201 based on the word vector. Based on the search result, the shared value determination unit 208 calculates the number of documents and the average number of accesses included in the search result. The search history at this time is a search for document evaluation and is not a general search, so it need not be registered in the search database 202. Of course, you can register.

  The history search unit 207 searches the search history registered in the search history database 202 using the degree of matching (similarity) based on the word vector. The degree of matching can be obtained, for example, by accumulating the weight of the keyword included in the target search history by taking it out from the word vector elements of the evaluation target document (substantially inner product). A search history (similar search history) in which the fitness level exceeds a predetermined threshold is notified to the shared value determination unit 208. The shared value determination unit 208 acquires the number of documents included in each similar search history and the average usage rate. The shared value determination unit 208 calculates the shared value and supplies the calculated value to the shared value display unit 302 of the user terminal 30. In this example, evaluation values for “popularity”, “request”, “new”, and “trend” (see FIG. 6) are used. The evaluation value may be a true / false binary value.

  A specific operation example of the shared value determination unit 208 will be described later with reference to FIG.

  The sharing instruction unit 303 of the user terminal 30 transmits a sharing instruction, that is, public registration, to the server system 20 based on the display on the shared value display unit 302. The document registration unit 203 of the server system 20 registers target document information (FIG. 4) in the document database 201 based on the sharing instruction. This allows other users to access the document. The level of disclosure (access) may be managed separately for search, browsing, update, and other types.

  Next, a specific operation example of the shared value determination unit 208 will be described mainly with reference to FIG.

  The shared value determination unit 208 determines the shared value of the designated document according to the following procedure. Information sharing value generally has multiple criteria. For example, the following types of shared value can be considered.

“Popularity”: The information is likely to be used by many people “Request”: The information is required “New”: The information is new “Trend”: The present value of the information

  First, it is confirmed whether or not a document having almost the same content as the designated document already exists in the document database 201. In other words, if there are more than a certain number of documents whose similarity to the document is higher than a certain threshold, it is determined that there is a high possibility that documents with the same content already exist, and the shared value is determined to be low. To do. In other cases, the type and level of shared value are estimated based on the following determination.

(Case 1) Determining whether the information is more commonly requested (used) ("Popularity" is high)
When the usage rate of a search result hit in a past search history similar to the document to be judged is high, it indicates that many documents related to the contents are used, and the document is also used. It is determined that the possibility is high, and the shared value “popularity” is determined to be high.

(Case 2) Judgment of whether the information is requested but likely not to exist (“Request” is high)
If the usage rate of the search result document is low with respect to the number of hits in the past search history similar to the document to be determined, the document currently registered in the document DB contains the requested document. It is determined that there is a high possibility that it does not exist, and it is determined that the shared value “request” is high.

(Case 3) Judgment as to whether or not the information has been obtained (used) in the past and has no track record ("Popularity" is low)
If there is no past search history similar to the document to be judged and the number of similar documents used is small, it will be judged whether it will be used even if it is registered, and the shared value "popularity" is low Is determined. However, it is not obsolete information.

(Case 4) Judgment whether or not the information is new (unlikely)
If there is no document whose similarity with the document to be judged falls within a certain threshold, it is determined that the information is likely to be new information that does not exist in the document database. Is determined to be high.

(Case 5) Information that has become particularly demanded recently ("trend" is high)
If the document to be judged contains many keywords that frequently appear in the search history that was performed during a certain period from the current time among the search keywords used in the past search history, It is determined that the shared information “trend” is high.

  In this embodiment, based on the shared value criteria (Case 1) to (Case 5), a plurality of shared value determinations are performed on the same information / document, thereby determining the shared value type of the document to be determined. It is possible to determine whether to identify and share.

  FIG. 2 is a flowchart showing a main part of the shared value determination process. Hereinafter, a processing example will be described.

[Step S10]: The word vector V and the search result Ld of the evaluation target document are acquired from the document search unit 205.
[Step S11]: It is determined whether the set of search results Ld is empty. If it is empty, the process proceeds to step S11, and if not, the process proceeds to step S13.
[Step S12]: It is determined that the shared value “new” is high (case 4). A value determination result indicating that “new” is true is output and the process ends.
[Step S13]: It is determined whether or not the number of elements of the search result Ld is greater than or equal to a certain value. If it is above a certain level, the process proceeds to step S14, and if not, the process proceeds to step S15.
[Step S14]: Since the number of elements of the search result Ld is greater than or equal to a certain value, the determination result is set to false because there is no shared value.
[Step S15]: A search history list Lh similar to the word vector V is acquired from the history search unit 207.
[Step S16]: It is determined whether or not the search history list Lh is empty. If it is empty, the process proceeds to step S17, and if not, the process proceeds to step S21.
[Step S17]: The average value Ad of the access numbers of the elements (documents) of the search result Ld by the word vector V of the document to be evaluated is obtained.
[Step S18]: It is determined whether or not the average value Ad of the number of accesses is equal to or less than a predetermined value Ca.
[Step S19]: Since the average value Ad of the number of accesses is equal to or less than a certain value Ca, it is determined that “popularity” is low (case 3). However, since the number of elements of the search result Ld is small, it is scarce.
[Step S20]: Since the average value Ad of the number of accesses exceeds a certain value Ca, the determination result is false because there is no shared value.
[Step S21]: The maximum value U of the utilization factor of the elements (search history) in the search history list Lh is calculated.
[Step S22]: It is determined whether or not the maximum utilization factor U of the elements (search history) in the search history list Lh is equal to or greater than a certain value Cu. If so, the process proceeds to step S24.
[Step S23]: It is determined that the shared value “popularity” is high (case 1).
[Step S24]: It is determined that the shared value “request” is high (case 2).

  The value of “trend” is determined by, for example, how many keywords in the search history of the search history of the search executed in the most recent predetermined period hold. FIG. 3 shows a processing example for determining the value of “trend”. The processing example of FIG. 3 is as follows.

[Step S30]: The word vector V of the document to be evaluated is acquired from the document search unit 205.
[Step S31]: A search history list Lh including keywords included in the word vector V is obtained from the history search unit 207.
[Step S32]: It is determined whether the number of elements of Lh is equal to or greater than a certain number. If the number is greater than a certain number, the process proceeds to Step S33, and if not, the process proceeds to Step S34.
[Step S33]: The shared value “trend” is determined to be high, and the process is terminated (case 5). "
[Step S34]: A city with a low shared value “trend” is determined, and the determination result is false, and the process is terminated.

  The determination of shared value can also be estimated for each user. That is, by identifying the share value for each user who has searched from the search history registered in the search history database 202, it is specified to which user the specified document to be judged is valuable. May be displayed.

  For information / documents determined to have shared value, the user decides whether to share / disclose. When the user decides that the document determined to have shared value can be disclosed, the sharing instruction unit 303 is used to instruct the document registration unit 203 of the server system 20 to share the document.

  FIG. 6 shows an example of a user interface of the information sharing support system 10 of this embodiment. The information sharing support system 10 is realized as a toolbar that is an extended function of a Web browser. On the toolbar, a button indicating the type of shared value and a button for instructing registration (a “register” button) are juxtaposed. In the example of FIG. 6, the shared value display unit 302 displays four types of shared values of “popular”, “request”, “new”, and “trend” as shared values. When a user views a Web page with a Web browser (FIG. 7), the content of the Web page is regarded as an input to the document input unit 301, and a shared value is determined. The determined shared value is highlighted on the toolbar by the shared value display unit 302.

  When the user intends to perform shared registration based on the shared value display, a “registration” confirmation dialog as shown in FIG. 8, for example, is displayed by pressing the “Register” button on the toolbar. Share registration is performed by pressing the “Yes” button in the confirmation dialog. Clicking the “No” button cancels sharing registration.

  The shared value can be estimated for each user. That is, by estimating the shared value for each user who has searched among the search histories registered in the search history database 202, as shown in FIG. You may identify and display whether it is valuable to you. In that case, whether the shared value display unit 302 is arranged as a button for each type of shared value, and the user information whose shared value is estimated is displayed and registered by pressing the button of each shared value type. You may encourage judgment.

  In the above embodiment, an example in which shared value is determined when a Web page is displayed by a Web browser has been described. However, the document creation application can be realized as an extended function. That is, registration of shared information is prompted by presenting a message prompting the user to register in the document DB together with shared value determination information when storing the created document.

  In addition, this invention is determined based on description of a claim, and is not limited to the specific structure of the Example, a subject, and an effect. The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

It is a block diagram which shows the example of a structure of the information sharing assistance system of the Example of this invention as a whole. It is a flowchart explaining the operation example of the principal part of the above-mentioned information sharing support system. It is a flowchart explaining the other operation example of the principal part of the said information sharing assistance system. It is a figure explaining the example of the document information table of the above-mentioned Example. It is a figure explaining the example of the search history table of the above-mentioned Example. It is a figure explaining the example of the user interface of the web browser of the evaluation value display of the above-mentioned Example. It is a figure explaining the example of the user interface of the web browser of the evaluation value display of the above-mentioned Example with a web document display example. It is a figure explaining the example of the registration confirmation dialog of the above-mentioned Example. It is a figure explaining the other example of the user interface of the web browser of the evaluation value display of the above-mentioned Example.

Explanation of symbols

10 Information Sharing Support System 20 Server System 20
30, 40 User terminal 60 Communication network 201 Document database 202 Search history database 203 Document registration unit 204 Search expression generation unit 205 Document search unit 206 History registration unit 207 History search unit 208 Shared value determination unit 301 Document input unit 302 Shared value display Unit 303 sharing instruction unit 401 search instruction unit 402 search result display unit

Claims (6)

Search target document storage means for storing a search target document group;
Search means for searching the search target document group stored in the search target document storage means;
Search history holding means for holding the search history searched by the search means;
A document input means for inputting a document to be evaluated;
Search expression generation means for generating a search expression from the evaluation target document input by the document input means;
Search history extraction means for extracting a search history similar to the search expression from the search history holding means using a search expression generated from the document to be evaluated;
The number of search target documents specified by the search executed on the search target document group by the search means using the search formula generated from the evaluation target document, and the search formula generated from the evaluation target document Evaluation means for evaluating the evaluation object document based on the search history extracted by the search history extraction means,
Display means for displaying the evaluation result of the evaluation means;
Setting means for selectively sharing and setting the evaluation target document according to a user operation,
The evaluation means is
If the number of search target documents specified by the search performed on the search target document group by the search means using the search formula generated from the evaluation target document is smaller than a predetermined value N1, the first Evaluate that type has shared value,
The number of search target documents specified by the search executed on the search target document group by the search means using the search formula generated from the evaluation target document is N1 or more and N2 (where N2> N1) and a predetermined use of a search target document included in each search result of one or a plurality of search histories extracted by the search history extraction unit with respect to a search expression generated from the evaluation target document. If the rate is greater than or equal to the predetermined value M1, evaluate that there is a second type of shared value,
The number of search target documents specified by the search executed on the search target document group by the search means using the search formula generated from the evaluation target document is N1 or more and a predetermined value N3 (however, N3> N1), and a predetermined search target document included in each search result of one or a plurality of search histories extracted by the search history extraction unit with respect to a search expression generated from the evaluation target document. If the utilization rate of M2 does not exceed M2 (where M2 ≦ M1), the third type of shared value is evaluated,
Furthermore, the display means displays the shared value type.   2. The document evaluation apparatus according to claim 1, wherein N2 and N3 are equal, and M1 and M2 are equal.   The predetermined usage rate of the search target document included in each search result of the 1 or the search history is a maximum value among the average number of accesses of the search target document included in each search result of the search history. Or the document evaluation apparatus of 2.   The evaluation means has a number of search target documents specified by a search performed on the search target document group by the search means using a search expression generated from the evaluation target document, and N1 or more, and It is smaller than a predetermined value N4 (where N4> N1), there is no search history extracted by the search history extraction means for the search expression generated from the evaluation target document, and it is generated from the evaluation target document. When the predetermined access count of the search target document specified by the search executed on the search target document group by the search means using the search formula is less than or equal to the predetermined threshold access count, the fourth type The document evaluation apparatus according to claim 1, wherein the document evaluation apparatus evaluates that there is shared value.   The evaluation means uses the search history extraction means for a search expression generated from the evaluation target document with respect to a search history search expression of a search performed for a predetermined period from the current time of the evaluation target document. The first type is evaluated as having the fifth type of shared value when the number of search histories searched for a search history of a search performed during a predetermined period from the current time is equal to or greater than a predetermined number. 5. The document evaluation apparatus according to any one of 4 above. Computer
Search target document storage means for storing a search target document group;
Search means for searching for a search target document group stored in the search target document storage means;
Search history holding means for holding the search history searched by the search means;
Document input means for inputting the document to be evaluated,
Search expression generation means for generating a search expression from the evaluation target document input by the document input means;
Search history extraction means for extracting a search history similar to the search expression from the search history holding means using a search expression generated from the evaluation target document;
The number of search target documents specified by the search executed on the search target document group by the search means using the search formula generated from the evaluation target document, and the search formula generated from the evaluation target document Evaluation means for evaluating the evaluation object document based on the search history extracted by the search history extraction means,
Display means for displaying the evaluation result of the evaluation means;
Function as a setting means for selectively sharing and setting the evaluation target document according to the user's operation,
And the evaluation means is
If the number of search target documents specified by the search performed on the search target document group by the search means using the search formula generated from the evaluation target document is smaller than a predetermined value N1, the first Evaluate that type has shared value,
The number of search target documents specified by the search executed on the search target document group by the search means using the search formula generated from the evaluation target document is N1 or more and a predetermined value N2 (however, N2> N1), and a predetermined search target document included in each search result of one or a plurality of search histories extracted by the search history extraction unit with respect to a search expression generated from the evaluation target document. If the utilization rate of M is greater than or equal to M1, evaluate that there is a second type of shared value,
The number of search target documents specified by the search executed on the search target document group by the search means using the search formula generated from the evaluation target document is N1 or more and a predetermined value N3 (however, N3> N1), and a predetermined search target document included in each search result of one or a plurality of search histories extracted by the search history extraction unit with respect to a search expression generated from the evaluation target document. If the utilization rate of M2 does not exceed M2 (where M2 ≦ M1), the third type of shared value is evaluated,
Further, the display means is a document evaluation program for displaying the shared value type.