JPH06314297A - Device and method for processing of document and device and method for retrieving data base - Google Patents

Abstract

PURPOSE:To register a keyword extracted from inputted document information along with inputted document information in data base by converting the keyword into a regulated word. CONSTITUTION:A keyword candidate is extracted by a keyword extracting device from document information which is inputted by a document input device 11, keyword statistical information is generated by a keyword statistical information generator concerning to the extracted respective keyword candidates and keyword statistical information generated by referring to a relational word dictionary 16 is shared. The keyword importance degree of the respective keyword candidates is calculated based on keyword statistical information, a natural word/regulated word dictionary 21 is referred to and the keyword candidate is converted into the regulated word. The converted regulated word is registered in a data base 23 as the keyword of inputted document information along with the keyword importance degree.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a document processing apparatus and method, and a data base searching apparatus and method.

[0002]

2. Description of the Related Art A technique for automatically extracting a keyword from document information and evaluating the importance of the extracted keyword is described in Japanese Patent Laid-Open No. 3-135669.

However, this technique does not have a function of converting a keyword extracted from a document into a controlled word keyword. Therefore, when using a database system that registers a controlled word keyword as a keyword of a document, There is a problem in that the controlled word keyword must be manually added to the document and registered.

Also, when searching a database system in which controlled word keywords are registered as document keywords, there is a problem that natural language keywords must be converted into controlled word keywords in the search conditions. .

[0005]

DISCLOSURE OF THE INVENTION A first object of the present invention is to provide a document processing apparatus capable of registering the controlled word together with the input document information.

In the document processing apparatus according to the first aspect of the present invention, the document input means for inputting the document information, the keyword extracting means for extracting the keyword candidates from the document information input by the document input means, and the keyword extracting means for extracting the keyword candidates are extracted. A keyword statistical information creating means for creating keyword statistical information about the above keyword candidates, a classification importance evaluation rule dictionary in which importance evaluation rules and membership functions are registered in advance for each classification, and according to the classification of input document information By the importance evaluation rule selecting means for selecting the importance evaluation rule and the membership function registered in the classification importance evaluation rule dictionary, and the importance evaluation rule selecting means from the classification importance evaluation rule dictionary. The above key according to the selected importance evaluation rule and membership function Keyword importance evaluation means for calculating the keyword importance of the keyword candidates extracted by the keyword extraction means based on the keyword statistical information created by the keyword statistical information creation means, a plurality of natural languages, and the plurality of A natural language / controlled word dictionary in which a controlled word corresponding to the natural language is registered in advance, and the keyword candidates extracted by the keyword extracting means are converted into controlled words by referring to the natural language / controlled word dictionary. A controlled word generation means for converting the keyword importance of the keyword candidate calculated by the keyword importance evaluation means to a keyword importance of the controlled word, and the controlled word generated by the controlled word generation means and the above Data to be registered by associating the keyword importance of controlled words with the above-mentioned input document information And it includes a base system.

In the document processing method according to the first aspect of the present invention, the importance evaluation rule and the membership function are registered in advance in the classification-specific importance dictionary for each classification to correspond to a plurality of natural words and the plurality of natural words. The controlled words to be registered are registered in advance in the classification importance dictionary, the input document information is accepted, the keyword candidates are extracted from the input document information, and the keyword statistical information on the extracted keyword candidates is created. , The importance evaluation rules and membership functions registered in the classification importance evaluation rule dictionary are selected according to the classification of the input document information, and the importance selected from the classification importance evaluation rule dictionary is selected. Of the extracted keyword candidates based on the keyword statistical information created according to the degree evaluation rule and the membership function. -The keyword of the controlled word obtained by calculating the word importance, converting the extracted keyword candidate into a controlled word by referring to the natural language / controlled word dictionary, and converting the calculated keyword importance of the keyword candidate The degree of importance is registered in the database system in association with the generated controlled word and the keyword importance of the controlled word and the input document information.

According to the first invention, the keyword statistical information is created for each keyword candidate extracted from the input document information, and the keyword importance of the keyword candidate is calculated based on this. The extracted keyword candidates are
Since it is converted to a controlled word using a natural language / controlled word dictionary,
It is possible to add the input document information, the related controlled word, and its importance to the data base system for registration.

In a preferred embodiment of the document processing apparatus according to the first invention, a plurality of first headwords, the first
The keyword statistical information creating means further comprises a related word dictionary in which a related word related to each headword and a degree of relevance indicating a degree of relationship between the first headword and the related word are registered in advance. For each of the keyword candidates extracted by the keyword extracting means, a related word and a degree of association are read from the related word dictionary,
If the same word as the read related word for one keyword candidate is present in another keyword candidate, the keyword statistical information of the one keyword candidate is based on the keyword statistical information of the other keyword candidate and the read degree of association. At least a part of this is to be shared.

Therefore, the keyword statistical information of the extracted keyword candidates is created in consideration of the related words of the extracted keyword candidates.

In a preferred embodiment of the document processing apparatus according to the first aspect of the present invention, the plurality of second headwords and the classification importance for each of the second headwords are registered in advance for each classification to which it belongs. The classified importance dictionary and the classified importance of the keyword candidates extracted by the keyword extraction means are read from the classified importance dictionary, and the classified importance of the keyword candidate and the keyword statistical information of the keyword candidate are read. Further, there is further provided a classification determining means for determining the classification to which the input document information belongs, based on the information included in.

Therefore, even if no classification is added to the input document information, the classification to which the document information belongs can be obtained.

In a further preferred embodiment of the document processing apparatus according to the first invention, the database system registers a controlled word having a keyword importance of a predetermined threshold value or more as a keyword of input document information. To do.

In this way, since the keyword of low usefulness regarding the input document information is not registered, the subsequent retrieval can be performed accurately.

A second aspect of the present invention is to provide a data base retrieval apparatus capable of inputting document information as a retrieval condition and retrieving document information which is judged to be similar from the viewpoint of terms used in this document information. Has an aim.

According to a second aspect of the present invention, there is provided a data base search device which has a data base having search data including controlled word keywords relating to a plurality of document information, and the data base based on a given data base search condition. In the apparatus for searching the above-mentioned data base by using the data base system provided with the data base management means for searching, the document input means for inputting the document information as the search condition, and the document input means Keyword extracting means for extracting keyword candidates from the input document information, keyword statistical information creating means for creating keyword statistical information on the keyword candidates extracted by the keyword extracting means, importance evaluation rules and membership functions are classified. Pre-registered importance classification classification classification Rule dictionary, importance evaluation rule selecting means for selecting an importance evaluation rule and a membership function registered in the above-mentioned importance evaluation rule for each classification according to the classification of the input document information, the importance evaluation for each classification Extracted by the keyword extracting means based on the keyword statistical information created by the keyword statistical information creating means according to the importance evaluating rule and the membership function selected from the rule dictionary by the importance evaluating rule selecting means. A keyword importance evaluation means for calculating the keyword importance of the keyword candidate, a plurality of natural words, and a natural language / controlled word dictionary in which controlled words corresponding to the plurality of natural words are registered in advance, and the keyword extraction means Control the keyword candidates extracted by referring to the natural language / controlled word dictionary And the controlled word generated by the controlled word generating means as the keyword importance of the controlled word converted from the keyword importance of the keyword candidate calculated by the keyword importance evaluation means. Is used as a search keyword, and a data base search condition is created with the keyword importance as an importance level and given to the database management means, and at least the search data is acquired according to the created database search condition. The data base search condition creating means for searching and the matching degree calculating means for calculating the matching degree between the searched search data and the data base search condition are calculated based on the keyword importance.

According to a second aspect of the present invention, there is provided a data base search method, which comprises a data base having search data including controlled word keywords relating to a plurality of document information, and the data base based on a given data base search condition. In a device for searching the above-mentioned data base using a data base system having a data base management means for searching, the importance evaluation rule dictionary for each classification of importance evaluation rules and membership functions Are registered in advance for each classification, and a plurality of natural words and controlled words corresponding to the plurality of natural words are registered in the natural language / controlled word dictionary in advance, and the input document information is accepted as a search condition. ， Keyword candidates are extracted from the input document information, and keyword statistical information about the extracted keyword candidates According to the classification of the created and input document information, the importance evaluation rule and the membership function registered in the classification importance evaluation rule dictionary are selected and selected from the classification importance evaluation rule dictionary. The keyword importance of the extracted keyword candidates is calculated based on the created keyword statistical information according to the importance evaluation rule and the membership function, and the extracted keyword candidates are converted into the natural language / control. The keyword importance of the above-mentioned controlled word is converted into the controlled word by referring to the word dictionary, and the calculated keyword importance of the above-mentioned keyword candidate is set as the keyword importance of the above-mentioned controlled word. A database search condition is created as the degree of importance, and given to the above database management means, At least according to over scan search conditions to search for data for the search, the matching degree between the found the search data and the data base retrieval condition, and calculates based on the keyword importance degree.

According to the second invention, the keyword candidates are extracted from the document information input as the search condition, and the keyword importance of the extracted keyword candidates is calculated.
The keyword candidates are converted into controlled words to become search keywords, and database search conditions are created using these search keywords. The keyword importance is used as the importance of the search keyword in the created search condition. The database system searches the document information according to the database search condition created in this way. Document information and data about the search results
The degree of matching with the base search condition is calculated and output.

Therefore, the user can retrieve similar document information from the viewpoint of words and phrases used for the designated document information from the data base system by simply designating the document information. In addition, since the degree of agreement with the search condition is calculated for the retrieved document information, the user can select the retrieved document information based on this degree of agreement.

In a preferred embodiment of the data base retrieval apparatus according to the second invention, the data base stores the plurality of document information in addition to the retrieval data relating to the plurality of document information, The above data
The base management means searches for search data that matches a given data base search condition, and then reads out document information related to the search data.

In this way, the document information that is judged to be similar in terms of terms used in the document information designated by the user can be retrieved from the database.

In a preferred embodiment of the data base retrieval apparatus according to the second aspect of the present invention, the matching degree calculating means reads the document information relating to the search data having the matching degree of a predetermined value or more.

Therefore, the user can obtain the important document information among the document information judged to be similar from the viewpoint of the term used for the designated document information.

In a preferred embodiment of the data base retrieval apparatus according to the second aspect of the present invention, a plurality of first headwords, related words related to each of the first headwords, and first related words and the above-mentioned relations. The keyword statistical information creating means further includes a related word dictionary in which a degree of relevance indicating a degree of relationship with a word is registered in advance, and the keyword statistical information creating means includes the related word dictionary for each of the keyword candidates extracted by the keyword extracting means. If the related word and the degree of relevance are read from, and the same word as the related word read for one keyword candidate is present in another keyword candidate, based on the keyword statistical information of the other keyword candidate and the read degree of relevance, At least a part of the keyword statistical information of the one keyword candidate is shared and corrected.

Therefore, the keyword statistical information of the extracted keyword candidates is created in consideration of the related words of the extracted keyword candidates.

In a preferred embodiment of the data base retrieval apparatus according to the second aspect of the present invention, a plurality of second headwords and the classification importance of each of the second headwords are registered in advance for each classification to which it belongs. The classified importance dictionary and the classified importance of the keyword candidates extracted by the keyword extraction means are read from the classified importance dictionary, and the classified importance of the keyword candidate and the keyword of the keyword candidate are read. The apparatus further includes a classification determining unit that determines a classification to which the input document information belongs, based on the information included in the statistical information.

Therefore, even if no classification is added to the input document information, the classification to which the document information belongs can be obtained.

The present invention provides an apparatus and method for creating a controlled word from input document information.

An apparatus for creating controlled words from input document information according to the present invention is a document input means for inputting document information, a keyword extracting means for extracting keyword candidates from the document information input by the document input means, A keyword statistical information creating means for creating keyword statistical information about the keyword candidates extracted by the keyword extracting means, an importance evaluation rule and a membership importance evaluation rule-based dictionary in which membership functions are registered in advance for each classification are input. The importance evaluation rule selecting means for selecting the importance evaluation rule and the membership function registered in the classification importance evaluation rule dictionary according to the classification of the document information, The importance evaluation rule and membership selected by the importance evaluation rule selection means. A keyword importance evaluation means for calculating the keyword importance of the keyword candidate extracted by the keyword extraction means based on the keyword statistical information created by the keyword statistical information creation means according to a function, and a plurality of natural words , And the natural language / controlled word dictionary in which controlled words corresponding to the plurality of natural languages are registered in advance, and the keyword candidates extracted by the keyword extracting means are referred to the natural language / controlled word dictionary. The control word generating means is provided for converting the control word into a control word and converting the keyword importance of the keyword candidate calculated by the keyword importance evaluation means into the keyword importance of the control word.

In the method of creating controlled words from the input document information according to the present invention, the importance evaluation rules and membership functions are registered in advance in the classification-specific importance evaluation rule dictionary for each classification, and a plurality of natural words are registered. , And the controlled words corresponding to the plurality of natural languages are registered in advance in the natural language / controlled word dictionary, the input document information is accepted, and the keyword candidates are extracted from the input document information and extracted. Create keyword statistical information about the keyword candidates, select the importance evaluation rules and membership functions registered in the classification importance evaluation rule dictionary according to the classification of the input document information, and select the above classification According to the importance evaluation rule and membership function selected from the importance evaluation rule dictionary, based on the above keyword statistical information, the extraction is performed. The keyword importance of the extracted keyword candidates is calculated, the extracted keyword candidates are converted into controlled words by referring to the natural language / controlled word dictionary, and the calculated keyword importance of the calculated keyword candidates is converted. The keyword importance of the controlled word is used.

According to the present invention, the keyword statistical information is created for each keyword candidate extracted from the input document information, and the keyword importance of the keyword candidate is calculated based on this. The extracted keyword candidates are converted into controlled words using a natural language / controlled word dictionary.

In this way, controlled words can be created from the input document information.

In a preferred embodiment of the apparatus for creating controlled words from input document information according to the present invention, a plurality of first headwords, related words related to the first headwords, and first headwords are provided. The keyword statistical information creating means further includes a related word dictionary in which a degree of association indicating a degree of association between the headword and the related word is registered in advance, and the keyword statistical information creating means is provided for each of the keyword candidates extracted by the keyword extracting means. If the same word as the related word read for one keyword candidate is present in another keyword candidate, the related word and the related degree are read from the related word dictionary, and the keyword statistical information of the other keyword candidate and the read related degree Based on the above, at least a part of the keyword statistical information of the above-mentioned keyword candidate is corrected in a shared manner. .

Therefore, the keyword statistical information of the extracted keyword candidates is created in consideration of the related words of the extracted keyword candidates.

In a preferred embodiment of the apparatus for creating controlled words from the input document information according to the present invention, a plurality of second headwords and the respective second headwords are classified according to the classification to which they belong. The category-specific importance dictionary in which the degree of importance is registered in advance, and the category-specific importance of the keyword candidates extracted by the keyword extracting means are read from the category-specific importance dictionary, and the keyword candidates are classified into the category-specific importance. It further comprises a classification determining means for determining the classification to which the input document information belongs based on the information contained in the keyword statistical information of the keyword candidates.

Therefore, even when no classification is added to the input document information, the classification to which the document information belongs can be obtained.

In a preferred embodiment of the apparatus for creating a controlled word from the input document information according to the present invention, the controlled word generation means has a keyword importance of a predetermined threshold value or more in the generated controlled words. The controlled word is selected as a keyword of the input document information.

Therefore, a useful controlled word can be created for the input document information.

The present invention provides an apparatus and method for classifying input document information.

An apparatus for classifying input document information according to the present invention is a document input means for inputting document information, a keyword extracting means for extracting keyword candidates from the document information input by the document input means, and the keyword extracting means. The keyword statistical information creating means for creating the keyword statistical information about the keyword candidates extracted by the above, a plurality of first headwords, and the classification importance for each category to which each of the first headwords belongs belongs in advance. The classified importance dictionary and the classified importance of the keyword candidates extracted by the keyword extraction means are read from the classified importance dictionary, and the classified importance of the keyword candidate and the keyword of the keyword candidate are read. Based on the information included in the statistical information, the attribute of the entered document information And a classification determining means for determining a classification that.

According to the method of classifying the input document information according to the present invention, a plurality of first headwords and the classification importance for each category to which the first headword belongs belong to the classification importance dictionary. Registered in advance, accepts the input document information, extracts keyword candidates from the input document information, creates keyword statistical information on the extracted keyword candidates, and classifies the extracted keyword candidates A method of reading the importance level from the classification importance dictionary and determining the classification to which the input document information belongs based on the classification importance of the keyword candidate and the information included in the keyword statistical information of the keyword candidate. Is.

In this way, the input document information is
Classification can be performed using a classification-based importance dictionary.

In a preferred embodiment of the apparatus for classifying input document information according to the present invention, a plurality of first headwords, related words related to each of the first headwords, and first headwords The keyword statistical information creating means may further include a related word dictionary in which a degree of association indicating a degree of association with the related word is registered in advance, and the keyword statistical information creating means may provide the above-mentioned association for each of the keyword candidates extracted by the keyword extracting means. If the related word and the degree of association are read from the word dictionary and the same word as the related word read out for one keyword candidate is present in another keyword candidate, based on the keyword statistical information of the other keyword candidate and the above-mentioned degree of association read out. Then, at least a part of the keyword statistical information of the one keyword candidate is corrected in a shared manner.

Therefore, the keyword statistical information of the extracted keyword candidates is created in consideration of the related words of the extracted keyword candidates.

[0045]

[Explanation of Examples]

First Embodiment FIG. 1 is a block diagram showing the overall configuration of a document processing apparatus according to the first embodiment. In this embodiment, natural language keywords are extracted from a patent document, and the extracted natural language keywords that are determined to be important are converted into pre-determined controlled word keywords for patent document retrieval. It is stored in the database together with the document.

This document processing device can be realized entirely by a hardware architecture,
It can also be realized by a programmed computer system. Further, a part of the document processing device can be realized by hardware and the other part can be realized by software.

The document input device 11 is for inputting patent document information (document data), and is composed of a keyboard, an image reader, and a character recognition device for converting the image information read by the keyboard into a character code. It is realized by a reading device or the like for inputting the converted file.

FIG. 2 shows an example of patent document information input from the document input device 11.

A patent publication is shown as an example of patent document information. The patent document information includes patent publication number, international patent classification, invention name, inventor name, applicant name and other method data relating to the patent application, and a description describing the technical content of the invention. Items such as “title of invention”, “claims”, and “detailed description of invention” are added to the description.

The document information input from the document input device 11 is given to the keyword extracting device 12 and the database management system 22.

The keyword extracting device 12 includes the document input device 11
The keyword candidates that are the keyword candidates are extracted from the patent document information given by the above.

The longest match method, syntactic analysis and the like are used to extract the keyword candidates. For example, the keyword candidate extraction process is performed as follows.

First, from the document represented by the input patent document information, a phrase having a particle such as "ga, ha, ni, o, na, na, etc."("word + particle") or A noun that ends with blatant words is searched for. Also". ,,,,, {}, “”, [], (), [] ”and other clauses (“ word + symbol ”) are searched for. The found clause is taken out from the sentence. Particles or symbols are deleted from the extracted clauses, and words, that is, keyword candidates are extracted.

FIG. 3 shows keyword candidates extracted from the patent document information shown in FIG. 2 as described above.

The extracted keyword candidates are given from the keyword extracting device 12 to the keyword statistical information creating device 13.

The keyword statistical information creation device 13 creates keyword statistical information for each keyword candidate given from the keyword extraction device 12 and refers to the related word dictionary 14 to find a related word of one keyword candidate. , If the related word found is the same word as other keyword candidates, the number of appearances, the number of emphasized expressions and the grammatical information included in the keyword statistical information of the one keyword candidate are set to the value of the found related word. This is a shared correction using keyword statistical information. This sharing modification is performed for every keyword candidate.

An example of the related word dictionary 14 is shown in FIG. The related word dictionary 14 is realized by a memory such as a hard disk or a ROM. In the related word dictionary 14, for each headword,
The related word related to the headword and the degree of association indicating the degree of association between the headword and the related word are registered in advance.

The creation of the keyword statistical information for each of the keyword candidates given from the keyword extracting device 12 is performed as follows.

The types of keyword statistical information include the number of characters, the type of characters, the type of words, the number of appearances, the position of appearance, the number of emphasized expressions, grammatical information, and the like.

The number of characters represents the number of characters included in the character string forming the keyword candidate. For example, the number of characters of the keyword candidate “error detection” is “5”.

The character type represents the type of character included in the character string forming the keyword candidate. The types of characters include kanji, hiragana, katakana, alphabets and numbers. For example, the character type of the keyword candidate “error detection” is “mixed katakana and kanji”.

The word type represents the type of word that is a keyword candidate (grammatical part of speech or something similar thereto).
The types of words include general nouns, company names, and personal names. For example, the word type of the keyword candidate “error detection” is “general noun”.

The number of appearances represents the number of times the same keyword candidate appears in one input document information. For example, the number of appearances of the keyword candidate “error detection” is “2”.

The appearance position represents in what position the keyword candidate appears in the input character information. The appearance position is represented by the items such as the title of the invention, the claims, and the detailed description of the invention described above. For example,
The keyword candidate “error detection” appears in “Claims, Detailed Description of the Invention”.

The number of emphasized expressions represents the number of times the emphasized expressions (eg, "", [], """, etc.) are added to the keyword candidates. For example, since the keyword candidate “error detection” has no emphasized expression, the number of emphasized expressions is “0”.
Is.

The grammatical information is "
Represents the number of times a particle such as ”is attached. For example,
Immediately after the keyword candidate “error detection”, the particle “o” is attached twice.

FIG. 4 shows an example of the keyword statistical information about some of the keyword candidates shown in FIG.

The shared correction processing of the keyword statistical information created for each keyword candidate is performed as follows.

The keyword statistical information creating device 13 is related word dictionary 14 for each of the given keyword candidates.
Is read and the related word of the keyword candidate and its related degree are read out. The related word read out is searched for from the given keyword candidates. If a related word is present in a given keyword candidate, a part of the keyword statistical information of the keyword candidate to which the related word is related may be modified by sharing based on the keyword statistical information and the degree of association of the related word. Done. The following calculation is performed for each item of the number of characters, the number of appearances, the number of emphasized expressions, and the grammatical information in the keyword statistical information.

Number of Characters: MAX [Number of Characters, (Number of Characters of Related Words) × (Relevance)] (1) Number of Occurrences: Number of Occurrences + Σ [(Number of Occurrences of Related Words) × (Relevance)] (2) Emphasis Number of expressions: number of emphasized expressions + Σ [(number of emphasized expressions of related words) × (relevance)] (3) Grammar information: number of “ga” + Σ [(number of related words “ga”) × (relevance )] (4): Number of "ha" + Σ [(number of "ha" of related words) x (relevance)] ... (5): Number of "ni" + Σ [(of related words "ni" (Number of times) × (degree of relevance)] (6): Number of "wa" + Σ [(number of times of "wa" of related words) x (degree of relevance)] (7)

When the calculation is performed for each item by the expressions (1) to (7), the keyword statistical information such as the number of characters of the keyword candidate, the number of appearances, the number of emphasized expressions and the grammatical information is
It is replaced with the corresponding keyword statistical information calculated by equations (1) to (7).

For example, referring to the related word dictionary 14 shown in FIG. 5, the keyword candidate “error detection” includes the related word “error recognition”. Since "error recognition" exists in the given keyword candidates, the keyword statistical information of this related word "error detection" and the degree of association "1.0" are used to make a shared correction of the keyword candidates "error detection". Be done. Therefore, if sharing is performed using equations (1) to (7), the number of characters is MAX [5,5 × 1.0] =
5, the number of appearances is 2 + 1 × 1.0 = 3, the number of emphasized expressions is 0+
0x1.0 = 0, grammar information is "wa": 2 + 0x1.0 =
2, “ga”: 0 + 1 × 1.0 = 1. The keyword statistical information of the keyword candidate “error detection” is replaced with the one calculated in this way.

The above is the shared correction processing of the keyword statistical information.

This shared correction processing is not performed on keyword candidates for which related words are not registered in the related word dictionary 14.

FIG. 6 shows the keyword statistical information shared for the keyword candidates shown in FIG. 4 in this way. In FIG. 6, sharing correction is performed only for the keyword candidate “error detection”.

The shared keyword statistical information is given to the classification determination device 15 and the keyword importance evaluation device 19.

The classification determining device 15 uses the keyword statistical information provided from the keyword statistical information creating device 13 for the input patent document information, and refers to the classification importance dictionary 16 to newly determine the international patent classification. Is.

An example of the classification importance dictionary 16 is shown in FIG. The classification importance dictionary 16 is a hard disk, RO
It is realized by a memory such as M. In the classification importance dictionary 16, the classification importance of each category for each headword is registered in advance.

The classification determining device 15 obtains the classification importance in each classification for each keyword candidate given from the keyword statistical information creating device 13 from the classification importance dictionary 16. Also, the number of appearances included in the keyword statistical information of each keyword candidate is obtained. Using the obtained classification-specific importance and the number of appearances of each keyword candidate, the sum of classification-specific importance is calculated for each classification by the following formula (B62D, C01, G0).
6F, H01G, etc.).

Sum of importance by classification = Σ (importance by keyword of keyword candidate) × (number of appearances of keyword candidate) (8)

Therefore, the sum of the classification importances in each classification of the patent document information shown in FIG. 2 is as follows using the equation (8).

Sum of importance by classification (classification “B62D”) = (0.50 / error detection) × 3 + (0.45 / conditional branch) × 1 + (0.50 / short time) × 1 + ... = 1.50 + 0.45 + 0. 50 +… Sum of importance by classification (classification “C01”) = (0.50 / error detection) x 3 + (0.30 / conditional branch) x 1 + (0.10 / short time) x 1 + ... = 1.50 + 0.30 + 0.10 + … Sum of importance by classification (classification “G06F”) = (0.85 / error detection) x 3 + (0.75 / conditional branch) x 1 + (0.60 / short time) x 1 + ... = 2.55 + 0.75 + 0.60 + ... Sum of importance by classification (classification "H01G") = (0.65 / error detection) x 3 + (0.60 / conditional branch) x 1 + (0.55 / short time) x 1 + ... = 1.95 + 0.60 + 0.65 + ...

A histogram is created on the basis of the obtained sum of classification-based importance in each classification. An example of the created histogram is shown in FIG.

The maximum of this histogram, ie,
The classification “G06F” is selected, and the classification to which the input patent document information belongs is determined to be G06F “digital computer in which at least a part of calculation is electrically performed; computer digital handling device”.

The determined classification is added to the input patent document information as the international patent classification. The international patent classification already assigned to the patent publication (Fig. 2) is preserved. The international patent classification determined by the classification determination device 15 is used in the importance evaluation rule selection device 17 as described later, and is also checked for the already assigned international patent classification, and is classified over multiple fields. It is also used to check if there is a possibility.

The determined classification is given from the classification determining device 15 to the importance evaluation rule selecting device 17.

The importance evaluation rule selection device 17 selects the importance evaluation rules registered in advance in the classification-based importance evaluation rule dictionary 18 for each classification based on the classification determined by the classification determination device 15. Is.

In the category-specific importance evaluation rule dictionary 18, importance evaluation rules are stored in advance for each classification, and membership functions related to the types of keyword statistical information and related items are registered in advance. There is. Classification importance dictionary 18 is a hard disk,
It is realized by a memory such as a ROM.

"Digital computer in which at least part of calculation is performed electrically; device for handling computer digital"
An example of a set of importance rating rules for (G06F) is shown below.

Importance evaluation rule 1 IF number of characters = small number of characters = * word type = general noun appearance count = small appearance position = * emphasized expression count = small grammatical information (number of "ga" + number of "ha") / (Number of occurrences) = Small (number of “ni” + number of “”) / (number of occurrences) = Some THEN importance = 0.2 Importance evaluation rule 2 IF number of characters = small character type = Kanji and Hiragana mixed word type = General nouns Number of occurrences = Low Number of occurrences = * Number of emphasized expressions = Little Grammar information (number of "ga" + number of "ha") / (number of occurrences) = Little (number of "ni" + number of "wa") / (Number of occurrences) = Normal THEN Importance = 0.4 Importance rating rule 3 Number of IF characters = Normal Character type = * Word type = * Number of occurrences = Normal Occurrence position = * Number of emphasized expressions = Normal Grammar information (of "ga" Number + number of "ha") / (number of appearances) = normal (number of "ni" + number of "wa") / (number of appearances) = normal THEN importance = 0.6 importance evaluation rule 4 IF characters = large characters Type = * Word type = Company name, personal name Number of occurrences = Many Occurrence positions = Claims, detailed explanation of invention Number of emphasized expressions = Many Grammar information (number of "ga" + number of "ha") / ( Number of occurrences = Many (number of "ni" + Number of ")" / (Number of occurrences) = Normal THEN Importance = 0.8 Importance rating rule 5 IF number of characters = Many character types = Katakana, mixed Kanji, alphabet, Kanji Mixed word type = Company name, personal name Number of occurrences = Many Occurrence position = Name of invention, scope of claims Number of emphasized expressions = Many Grammar information (number of "ga" + number of "ha") / (number of occurrences) = Many (number of "ni" + "of" Number) / (number of occurrences) = average THEN Severity = 1.0

The * in the antecedent part (IF) of the importance evaluation rules 1 to 5 indicates that the keyword statistical information is not used.

Regarding the grammar information, the number of times a particle "ga" or "ha" is used as a subject and the number of times a particle "ni" or "wa" is used as an object are separately considered. . Moreover, by dividing these numbers by the number of appearances, the ratio of the number of times used as the subject and the ratio of the number of times used as the object are variables of the antecedent part in the importance evaluation rule.

As can be seen from these importance evaluation rules,
Variables in the antecedent part "Number of characters", "Number of appearances", "Number of emphasized expressions", "(Number of" ga "+ number of" ha ") / (Number of appearances)" (ratio of the number of times used as subject) and "(Number of" ni "+ number of" wa ") / (number of appearances)"
(Ratio of the number of times it is used as an object) is expressed by fuzzy set expression. On the other hand, the variables “character type”, “word type”, “appearance position” in the antecedent part and “importance” in the consequent part are represented by a crisp set expression.

Membership functions are prepared in advance for the variables represented by the fuzzy set representation, and are registered in the classification-based importance evaluation rule dictionary 18 as described above.
FIGS. 9A to 9E show examples of these membership functions. (A), (B), (C), (D) and (E) are the number of characters, the number of appearances, the number of emphasized expressions, (the number of "ga" + the number of "ha") / (the number of occurrences) and Regarding (number of "ni" + number of "wa") / (number of appearances), three membership functions of language information "low", "normal" and "high" are shown.

The importance evaluation rule selection device 17 refers to the importance evaluation rule selection table stored in a predetermined storage location and selects the importance evaluation rule based on the given classification.

FIG. 10 shows an example of the importance evaluation rule selection table.
Is shown in.

Since the classification determined by the classification determining device 15 is "G06F", the importance evaluation rule for "a digital computer in which at least a part of calculation is performed electrically; a device that handles computer digital" is selected. . In response to this, the importance evaluation rule and the membership function are read out from the classification importance evaluation rule dictionary 18. The read importance evaluation rule and membership function are given to the keyword importance evaluation device 19.

The keyword importance evaluation device 19 follows the keyword evaluation information provided by the keyword evaluation information selection device 17 and uses the keyword statistical information for each keyword candidate provided by the keyword statistical information creation device 13 to determine the keyword The keyword importance of the candidate is calculated (or evaluated).

The keyword importance of the keyword candidate is calculated as follows.

According to the importance evaluation rule given from the importance evaluation rule selection device 17, for the fuzzy variables represented by the membership function, the keyword statistical information for the membership function (or obtained by processing these is obtained. Information) is calculated. For variables in the crisp set expression (that is, character type, word type, and appearance position), if the given keyword statistical information matches the condition in the antecedent part of the evaluation rule, the goodness of fit is "1.
0 ", and if they do not match, it is set to" 0.0 ".

The sum of the antecedent part conformances obtained by matching is calculated for each importance evaluation rule.

FIG. 11 shows the sum of the matching results and the goodness of fit for the keyword candidate “error detection” thus obtained. In FIG. 11, * indicates that it is not used in the antecedent part of the importance evaluation rule.

The maximum value and the second largest value are searched for in the sum of the calculated goodness of fit, and the importance described in the consequent part of the importance evaluation rule that causes them is extracted. It

Based on the maximum value and the second largest value of the obtained total sum of the goodness of fit and the corresponding degrees of importance,
The keyword importance of the keyword candidate is calculated by the weighted average represented by the following formula.

Keyword importance = [(maximum value of goodness of fit) × (importance corresponding to maximum value) + (second largest value of goodness of fit) × (importance corresponding to second largest value)] / [(The maximum value of the goodness of fit) + (the second largest value of the goodness of fit)] (9)

The maximum value of the goodness of fit of the keyword candidate "error detection" shown in FIG. 11 is "4.7", the second largest value is "3.7", and the corresponding degrees of importance are "1.0" and It is "0.8". Therefore, according to Eq. (9), the keyword importance of the keyword candidate “error detection” is [(4.7 × 1.0) + (3.7 × 0.8)] / [4.7 + 3.
7] = 0.91.

In this way, the keyword importance of all the extracted keyword candidates is calculated. An example of the calculated keyword importance is shown in FIG.

The keyword candidates and the keyword importance thereof are given from the keyword importance evaluation device 19 to the natural language / controlled word conversion device 20.

The natural language / controlled word conversion device 20 refers to the natural language / controlled word dictionary 21 and converts a given keyword candidate (natural language) into a controlled word keyword (controlled word).

A controlled word is a word whose meaning range and usage are defined by a thesaurus, subject heading table, and the like. Examples of controlled words related to patent documents include the F term (File For
mingTerm). On the other hand, a natural language is a phrase that does not have any regulation, and a natural language is a phrase extracted from, for example, a document.

An example of the natural language / controlled language dictionary 21 is shown in FIG. The natural language / controlled language dictionary 21 is a hard disk,
It is realized by a memory such as a ROM. In the natural language / controlled word dictionary 21, a controlled word and a natural language related to this controlled word are registered in advance in association with each other. A controlled word code is added to the controlled word.

Conversion processing of keyword candidates into controlled words is performed as follows.

The natural language / controlled word conversion device 20 uses the natural language / controlled word dictionary for each of the given keyword candidates.
21 is searched, and the controlled words and the controlled word codes corresponding to them are read out. The keyword importance of the keyword candidate is the keyword importance of the corresponding controlled word read out.

For example, the keyword candidate “error detection”
For, the controlled word “error detection and reliability improvement” and its controlled word code “5B022FA11” are read from the natural language / controlled word dictionary 21. The keyword importance “0.91” of the keyword candidate “error detection” becomes the keyword importance of the controlled word “error detection and reliability improvement”.

FIG. 14 shows the controlled words converted for the keyword candidates shown in FIG.

The natural language / controlled word conversion device 20 also performs threshold processing on the converted controlled word based on the keyword importance thereof to create index data of the input patent document information.

The threshold processing is performed as follows.

The natural language / controlled word conversion device 20 creates index data of patent document information using a controlled word having a keyword importance greater than a predetermined threshold as a keyword. A controlled word having a keyword importance smaller than the threshold is deleted and is not used as index data.

For example, if the threshold is set to 0.5,
When the controlled word shown in FIG. 14 is subjected to the threshold processing, the controlled words “comparison, determination” and “calculation mode” are deleted, and the controlled word “error detection, reliability improvement” becomes a keyword. Therefore, the index data is as shown in FIG. The index data includes method data such as patent publication number, international patent classification, and title of invention.
Here, as the international patent classification, the one determined by the classification determination device 15 (the upper part of FIG. 15) and the one previously assigned to the document (the same, the lower part) are added.

The created index data is transferred from the natural language / controlled word conversion device 20 to the data base management system 22.
Given to.

The data base 23 is composed of a document file 23a and an index file 23b. Document file
The input patent document information is registered in 23a, and the index data relating to the input patent document information is registered in the index file 23a. index·
The index data of the file 23b and the corresponding patent document information of the document file 23a are linked to each other.

The data base management system 22 manages the data base 23.
Registration of document information, index data, etc. in 23, and other processing.

The data base management system 22 connects the patent document information given from the document input device 11 and the index data given from the natural language / controlled word conversion device 20, and links the document file 23a and the index file, respectively. Register in file 23b.

As a database 23, an index
When a known system having no file is used, index data is registered in a storage device provided separately.

Second Embodiment FIG. 16 is a block diagram showing the overall structure of a data base retrieval apparatus according to the second embodiment.

In the second embodiment, patent document information is input as a search condition. The apparatus of the second embodiment extracts a search keyword from this patent document information and searches the database 33 for patent document information similar to the input patent document information.

The database retrieving apparatus in the second embodiment can be realized entirely by a hardware architecture like the document processing apparatus in the first embodiment, or by a programmed computer system. You can also It is also possible to implement part of the data base retrieval device by hardware and the other part by software.

In FIG. 16, the same parts as those shown in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

The data base 33 comprises a document file 33a and a search data file 33b. Document file
Digitized patent document information such as open patent publications and published patent publications is registered in advance in 33a. Further, in the search data file 33b, for each of the patent document information registered in the document file 33a, formal information regarding the patent application, controlled word keywords, and controlled word codes (hereinafter, these are collectively referred to as "searched data"). "Data") is registered in advance.

The data base 33 is a search data
It may have only the file 33b. In this case, the patent document information is represented by image data or on a print.

The data base management system 32 manages the data base 33, and retrieves the data base and performs other processing. Details of the search processing by the database management system 32 will be described later.

The natural language / controlled word conversion device 30 refers to the natural language / controlled word dictionary 21 and refers to the keyword statistical information creation device 13
The keyword candidates (natural language) given by are converted into controlled word keywords (controlled words).

Conversion processing of keyword candidates into controlled word keywords is performed as follows.

The natural language / controlled word conversion device 30 uses the natural language / controlled word dictionary for each of the given keyword candidates.
21 is searched and the controlled word keyword and its controlled word code are read. The keyword importance of the keyword candidate is the keyword importance of the read controlled word keyword.

For example, the keyword candidate “error detection”
For, the controlled word “error detection and reliability improvement” and its controlled word code “5B022FA11” are read from the natural language / controlled word dictionary 21. The keyword importance “0.91” of the keyword candidate “error detection” becomes the keyword importance of the controlled word keyword “error detection and reliability improvement”.

FIG. 17 shows the controlled word keywords converted for the keyword candidates shown in FIG.

The converted controlled word keyword is converted from the natural language / controlled word converting device 31 to the data base search condition creating device 32.
Given to.

The data base search condition creating device 31 is a data base search condition for searching the data base 33 based on the controlled word keyword given from the natural language / controlled word conversion device 30 and its keyword importance. Is to create.

The data base search condition creating device 31 creates a data base search condition with the given controlled word keyword as the search keyword and the keyword importance of the controlled word keyword as the importance level. The degree of importance is the degree of importance of the search keyword. The search keywords are combined by a logical sum OR to create a search condition expression.

For example, the search conditions for the controlled word keywords shown in FIG. 18 are as follows. Search condition formula (“Error detection, reliability improvement” OR importance 0.91 “Comparison, judgment” OR “Processing time, calculation speed”)… (10) 0.29 0.29

The search condition expressed by the equation (10) is coded and expressed as follows. S1 = ((FT = 5B0222FA11) importance 0.91 + (FT = 5B0220A06) + (FT = 5B0222FA01)) 0.29 0.29 (11) where "S1" is a search condition expression, "FT" is a controlled word code, and " “+” Represents a logical sum combination “OR”.

The created search conditions are provided to the data base management system 32 and the matching degree calculation device 34 as data base search conditions.

Data base management system 32
The search data file 33b is searched from the data base 33 based on the data base search condition given from the base search condition creating device 31. The search data including at least one search keyword in the data base search condition is obtained from the search data file 33b.

FIG. 18 shows an example of the search result obtained by the search.
Is shown in.

The search result obtained by the search is data.
It is given from the base management system 32 to the matching degree calculation device 34.

The matching degree calculation device 34 calculates the matching degree between the data base search condition given from the data base search condition creating device 31 and the keyword contained in the search data obtained from the search data base 33. .

The degree of matching is a degree indicating how much the keyword of the retrieval data obtained by the retrieval satisfies the data base retrieval condition, and is represented by a number of 0.0 to 1.0. The closer the match is to 1.0, the more satisfied the database search condition is.

The degree of matching is calculated by the following equation using the degree of importance of the search keyword that matches the keyword in the search data.

Matching degree = [Σ (weighting degree of matching search keyword) / Σ (weighting degree of all search keywords)] (12)

With respect to the search results shown in FIG. 18, FIG. 19 shows a list of patent document information keywords, search keywords that match the search keywords, and their importance levels.

For example, the patent publication number "P06-300"
The degree of coincidence of the patent document information of “01” is “(0.91 + 0.29) / (0.91 + 0.29 + 0.29) = 0.81” using the equation (12). The calculation result of the matching degree calculated in this way is shown in FIG.
Is shown in.

The patent document information obtained by the search is displayed and output from the output device 34 in descending order of coincidence. In addition, a threshold is set for the degree of matching, and search results above this threshold are displayed.
You may make it output.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of a document processing apparatus according to a first embodiment.

FIG. 2 shows an example of patent document information.

FIG. 3 shows an example of keyword candidates extracted from patent document information.

FIG. 4 shows an example of keyword statistical information.

FIG. 5 shows an example of a related word dictionary.

FIG. 6 shows an example of keyword statistical information.

FIG. 7 shows an example of a classification-based importance dictionary.

FIG. 8 is a histogram showing the total sum of importance for each classification.

[Fig. 9] (A), (B), (C), (D) and (E) are the number of characters, the number of appearances, the number of emphasized expressions, (the number of "ga" + "wa").
Number of times) / (number of appearances) and (number of "ni" + "wa"
With respect to (number of times) / (number of occurrences), the membership functions of the language information “small”, “normal” and “large” are shown respectively.

FIG. 10 shows an example of an importance evaluation rule selection table.

FIG. 11 shows an example of a matching result between keyword statistical information and a membership function.

FIG. 12 shows an example of keyword candidates and their keyword importance.

FIG. 13 shows an example of a natural language / controlled language dictionary.

FIG. 14 shows an example of a converted controlled word.

FIG. 15 shows an example of index data.

FIG. 16 is a block diagram showing an overall configuration of a data base search device according to a second embodiment.

FIG. 17 shows an example of a converted controlled word.

FIG. 18 shows an example of patent document information retrieved from a data base.

FIG. 19 shows a list of search keywords that match the patent document information keywords and the search keywords, and their importance levels.

FIG. 20 shows the retrieved patent document information and its matching degree.

[Explanation of symbols]

 11 Document information input device 12 Keyword extraction device 13 Keyword statistical information creation device 14 Related term dictionary 15 Classification determination device 16 Classification importance dictionary 17 Importance evaluation rule selection device 18 Classification importance evaluation rule dictionary 19 Keywords Importance evaluation device 20, 30 Natural language / controlled word conversion device 21 Natural language / controlled word dictionary 22, 32 Data base management system 23, 33 Data base 23a, 33a Document file 23b Index file 31 Data base search condition creation device 33b Search Data file 34 Matching calculation device 35 Search result output device

Claims (30)

[Claims] 1. Document input means for inputting document information, keyword extraction means for extracting keyword candidates from the document information input by the document input means, and keyword statistical information relating to the keyword candidates extracted by the keyword extraction means. A keyword statistical information creation means to be created, a classification importance evaluation rule dictionary in which the importance evaluation rules and membership functions are registered in advance for each classification, and the above-mentioned importance evaluation by classification according to the classification of the input document information. An importance evaluation rule selecting means for selecting an importance evaluation rule and a membership function registered in the rule dictionary; an importance evaluation rule selected by the importance evaluation rule selecting means from the classification-based importance evaluation rule dictionary; Created by the above keyword statistical information creation means according to the membership function Keyword importance evaluation means for calculating the keyword importance of the keyword candidates extracted by the keyword extraction means based on the obtained keyword statistical information, a plurality of natural words, and controlled words corresponding to the plurality of natural words Is registered in advance, the keyword candidates extracted by the keyword extracting means are converted into controlled words by referring to the natural language / controlled word dictionary, and the keyword importance evaluation means is used. A controlled word generation means for converting the calculated keyword importance of the keyword candidate into the keyword importance of the controlled word, and the controlled word generated by the controlled word generation and the keyword importance of the controlled word and input A document having a database system for registering the document information stored in association with the document information Management apparatus. 2. A plurality of first headwords, related words related to each of the first headwords, and a degree of relevance indicating a degree of relevance between the first headword and the related words are registered in advance. The related keyword dictionary is further provided, and the keyword statistical information creating means reads out the related word and the degree of association from the related word dictionary for each of the keyword candidates extracted by the keyword extracting means, and reads out one keyword candidate. If the same word as the related word is present in another keyword candidate, at least a part of the keyword statistical information of the one keyword candidate is shared based on the keyword statistical information of the other keyword candidate and the read degree of association. The document processing apparatus according to claim 1, wherein the document processing apparatus is adapted to perform a chemical modification. 3. A plurality of second headwords, and the second
For each headword, the category-by-category importance degree dictionary in which the category-by-category degree of importance is registered in advance, and the category-by-category degree of importance of the keyword candidates extracted by the keyword extracting means are as mentioned above. A classification determining unit that determines the classification to which the input document information belongs, based on the importance of each of the keyword candidates classified by category and the information included in the keyword statistical information of the keyword candidates. 1. The document processing device according to 1. 4. The database system registers a controlled word having a keyword importance of a predetermined threshold value or more as a keyword of input document information,
The document processing apparatus according to claim 1. 5. An importance evaluation rule and a membership function are registered in advance in a classification-specific importance dictionary for each classification, and a plurality of natural words and controlled words corresponding to the plurality of natural words are classified by importance. Register in the dictionary in advance,
Accepts the input document information, extracts keyword candidates from the input document information, creates keyword statistical information about the extracted keyword candidates, and classifies the input document information according to the classification. The keyword statistics created by selecting the importance evaluation rules and membership functions registered in the degree evaluation rule dictionary, and according to the importance evaluation rules and membership functions selected from the classification-based importance evaluation rule dictionary The keyword importance of the extracted keyword candidates is calculated based on information, the extracted keyword candidates are converted into controlled words by referring to the natural language / controlled word dictionary, and the calculated keyword candidates are calculated. The keyword importance of the controlled word is converted to the keyword importance of the controlled word, and the generated controlled word and the controlled word Keyword importance and is related to the input the document information registered in the data base system, a document processing method. 6. A related word dictionary stores a plurality of first headwords, related words related to each of the first headwords, and a degree of relevance indicating a degree of relevance between the first headword and the related words. For each of the extracted keyword candidates that have been registered in advance, the related word and the degree of association are read from the related word dictionary, and if the same word as the read related word for one keyword candidate exists in another keyword candidate, 6. The document processing method according to claim 5, wherein at least a part of the keyword statistical information of the one keyword candidate is shared-corrected based on the keyword statistical information of the other keyword candidate and the read degree of association. . 7. A plurality of second headwords and said second headword
For each headword of, the category-specific importance for each category to which it belongs is registered in advance in the category-specific importance dictionary, and the category-specific importance of the extracted keyword candidates is read from the category-specific importance dictionary. 6. The document processing method according to claim 5, wherein the classification to which the input document information belongs is determined based on the importance of the candidates by classification and the information included in the keyword statistical information of the keyword candidates. 8. The document processing method according to claim 5, wherein a controlled word having a keyword importance of a predetermined threshold value or more is registered in the database system as a keyword of the input document information. 9. A data base having search data containing controlled word keywords relating to a plurality of document information, and the data base based on a given data base search condition.
Document input means and document input means for inputting document information as a search condition in an apparatus for searching the above-mentioned data base using a data base system having a data base management means for searching the base A keyword extracting means for extracting a keyword candidate from the document information input by the above, a keyword statistical information creating means for creating keyword statistical information on the keyword candidate extracted by the keyword extracting means, an importance evaluation rule and a membership function. The importance evaluation rules and membership functions registered in the above-mentioned classification importance evaluation rule dictionary are selected according to the classification importance evaluation rule dictionary registered in advance for each classification and the classification of the input document information. Importance evaluation rule selection means, whether the above-mentioned classification-based importance evaluation rule dictionary The keyword extracted by the keyword extracting means based on the keyword statistical information created by the keyword statistical information creating means in accordance with the importance evaluation rule and the membership function selected by the importance evaluation rule selecting means. A keyword importance evaluation means for calculating the keyword importance of a candidate, a plurality of natural words, and a natural language / controlled word dictionary in which controlled words corresponding to the plurality of natural words are registered in advance, and extracted by the keyword extraction means. The keyword importance of the controlled word obtained by converting the keyword candidate into a controlled word by referring to the natural language / controlled word dictionary and converting the keyword importance of the keyword candidate calculated by the keyword importance evaluation means. Generated by the above controlled word generation means The serial control word as a search keyword, and create a data base search the keyword importance as a value level, the above-mentioned data
A data base search condition creating means for giving the base management means at least the search data according to the created database search condition, and the searched search data and the database search condition A database retrieval device comprising a matching degree calculating means for calculating the matching degree of the above based on the keyword importance. 10. The database stores the plurality of pieces of document information in addition to the search data relating to the plurality of pieces of document information, and the database management means gives a given database search condition. 10. The data base retrieval device according to claim 9, wherein the retrieval data matching with is searched out, and then the document information related to the retrieval data is read out. 11. The data base search device according to claim 10, wherein the matching degree calculation means reads document information relating to the search data having a matching degree of a predetermined value or more. 12. A plurality of first headwords, related words related to each of the first headwords, and a degree of relevance indicating a degree of relevance between the first headword and the related words are registered in advance. The related keyword dictionary is further provided, and the keyword statistical information creating means reads out the related word and the degree of association from the related word dictionary for each of the keyword candidates extracted by the keyword extracting means, and reads out one keyword candidate. If the same word as the related word is present in another keyword candidate, at least a part of the keyword statistical information of the one keyword candidate is shared based on the keyword statistical information of the other keyword candidate and the read degree of association. The data base retrieval device according to claim 9, which is for performing a sexual modification. 13. A plurality of second headwords, a category-specific importance dictionary in which a category-specific importance is registered in advance for each category to which each of the second headwords belongs, and the keyword extracting means. The category-specific importance of the extracted keyword candidates is read from the category-specific importance dictionary, and the input document is read based on the category-specific importance of the keyword candidates and the information included in the keyword statistical information of the keyword candidates. The data according to claim 9, further comprising: a classification determining unit that determines a classification to which the information belongs.
Base search device. 14. A data base having search data including controlled word keywords relating to a plurality of document information, and a database management means for searching the data base based on a given data base search condition. Using the provided data base system,
In an apparatus for searching a base, an importance evaluation rule and a membership function are registered in advance in a classification-based importance evaluation rule dictionary for each classification, and a plurality of natural words and a control corresponding to the plurality of natural words are controlled. Words are registered in the natural language / controlled word dictionary in advance, the input document information is accepted as a search condition, keyword candidates are extracted from the input document information, and keyword statistical information regarding the extracted keyword candidates is extracted. According to the classification of the created and input document information, the importance evaluation rule and the membership function registered in the classification importance evaluation rule dictionary are selected and selected from the classification importance evaluation rule dictionary. Based on the above keyword statistical information created according to the importance evaluation rules and membership functions, the above extracted The control in which the keyword importance of the word candidate is calculated, the extracted keyword candidate is converted into a controlled word by referring to the natural language / controlled word dictionary, and the calculated keyword importance of the calculated keyword candidate is converted. The data base search condition is created with the keyword importance of the word as the search keyword, the generated controlled word as the search keyword, and the keyword importance as the importance, and is given to the data base management means to create the data. A data base search in which the search data is searched at least according to the base search condition, and the degree of matching between the searched search data and the data base search condition is calculated based on the keyword importance. Method. 15. The database stores the plurality of pieces of document information in addition to the search data relating to the plurality of pieces of document information, and the database management means provides a given data base search condition. 15. The database search method according to claim 14, wherein after searching for the search data that matches with, the document information related to the search data is read. 16. The database search method according to claim 15, wherein the document information regarding the search data having a matching degree of a predetermined value or more is read. 17. A plurality of first headwords, related words related to each of the first headwords, and a degree of relevance indicating a degree of relevance between the first headword and the related words are registered in advance. A related word dictionary is further provided, and for each of the extracted keyword candidates, the related word and the degree of association are read from the related word dictionary, and the same word as the related word read for one keyword candidate is used as another keyword candidate. 15. The data according to claim 14, wherein at least a part of the keyword statistical information of the one keyword candidate is sharedly corrected based on the keyword statistical information of the other keyword candidate and the read degree of association. -Base search method. 18. A keyword candidate extracted from a plurality of second headwords and each of the second headwords registered in advance in a classification importance dictionary for each classification to which it belongs. Is read from the classification importance dictionary and the classification to which the input document information belongs is determined based on the classification importance of the keyword candidates and the information included in the keyword statistical information of the keyword candidates. The database search method according to claim 14, which is determined. 19. Document input means for inputting document information, keyword extraction means for extracting keyword candidates from the document information input by the document input means, and keyword statistical information relating to the keyword candidates extracted by the keyword extraction means. A keyword statistical information creation means to be created, a classification importance evaluation rule dictionary in which the importance evaluation rules and membership functions are registered in advance for each classification, and the above-mentioned importance evaluation by classification according to the classification of the input document information. An importance evaluation rule selecting means for selecting an importance evaluation rule and a membership function registered in the rule dictionary; an importance evaluation rule selected by the importance evaluation rule selecting means from the classification-based importance evaluation rule dictionary; Created by the above keyword statistical information creation means according to the membership function. Keyword importance evaluation means for calculating the keyword importance of the keyword candidates extracted by the keyword extraction means based on the generated keyword statistical information, a plurality of natural words, and controls corresponding to the plurality of natural words The natural language / controlled word dictionary in which words are registered in advance, and the keyword candidates extracted by the keyword extraction means are converted into controlled words by referring to the natural language / controlled word dictionary, and the keyword importance evaluation is performed. An apparatus for creating a controlled word from input document information, comprising controlled word generation means for converting the keyword importance of the keyword candidate calculated by the means into the keyword importance of the controlled word. 20. A plurality of first headwords, related words related to each of the first headwords, and a degree of relevance indicating a degree of relevance between the first headword and the related words are registered in advance. The related keyword dictionary is further provided, and the keyword statistical information creating means reads out the related word and the degree of association from the related word dictionary for each of the keyword candidates extracted by the keyword extracting means, and reads out one keyword candidate. If the same word as the related word is present in another keyword candidate, at least a part of the keyword statistical information of the one keyword candidate is shared based on the keyword statistical information of the other keyword candidate and the read degree of association. 20. An apparatus for creating a controlled word from the input document information according to claim 19, which is for making a chemical modification. 21. A plurality of second headwords, a category-specific importance dictionary in which a category-specific importance is registered in advance for each category to which each of the second headwords belongs, and the keyword extracting means. The category-specific importance of the extracted keyword candidates is read from the category-specific importance dictionary, and the input document is read based on the category-specific importance of the keyword candidates and the information included in the keyword statistical information of the keyword candidates. 20. An apparatus for creating a controlled word from the input document information according to claim 19, further comprising a classification determining means for determining a classification to which information belongs. 22. The controlled word generation means selects a controlled word having a keyword importance of a predetermined threshold value or more among the generated controlled words as a controlled word keyword of input document information, An apparatus for creating a controlled word from the input document information according to claim 19. 23. An importance evaluation rule and a membership function are registered in advance in a classification-based importance evaluation rule dictionary for each classification, and a plurality of natural words and control words corresponding to the plurality of natural words are assigned to natural words. / Registered in the controlled word dictionary in advance, accept input document information, extract keyword candidates from the input document information, create keyword statistical information on the extracted keyword candidates, and input document The importance evaluation rules and membership functions registered in the classification importance evaluation rule dictionary are selected according to the information classification, and the importance evaluation rules and members selected from the classification importance evaluation rule dictionary are selected. According to the ship function, the keyword importance of the extracted keyword candidates is calculated and extracted based on the keyword statistical information. The selected keyword candidates are converted into controlled words by referring to the natural language / controlled word dictionary, and the calculated keyword importance of the keyword candidates is converted into the keyword importance of the controlled words. How to create controlled words from document information. 24. A plurality of first headwords, related words related to each of the first headwords, and a degree of relevance indicating a degree of relevance between the first headword and the related words are stored in a related word dictionary. For each of the extracted keyword candidates that have been registered in advance, the related word and the degree of association are read from the related word dictionary, and if the same word as the read related word for one keyword candidate exists in another keyword candidate, 24. The input according to claim 23, wherein at least a part of the keyword statistical information of the one keyword candidate is shared based on the keyword statistical information of the other keyword candidate and the read degree of association. How to create controlled words from document information. 25. A plurality of second headwords and, for each of the second headwords, a classification importance for each classification to which it belongs are registered in advance in a classification importance dictionary, and extracted keyword candidates. Is read from the classification importance dictionary and the classification to which the input document information belongs is determined based on the classification importance of the keyword candidates and the information included in the keyword statistical information of the keyword candidates. A method of creating a controlled word from the input document information according to claim 23, which is determined. 26. The input document according to claim 23, wherein, of the generated control words, a control word having a keyword importance of a predetermined threshold value or more is selected as a control word keyword of the input document information. How to create controlled words from information. 27. Document input means for inputting document information, keyword extraction means for extracting keyword candidates from the document information input by the document input means, and keyword statistical information regarding the keyword candidates extracted by the keyword extraction means. Keyword statistical information creating means to be created, a plurality of first headwords, a category-specific importance dictionary in which a category-specific importance is registered in advance for each category to which each of the first headwords belongs, and the keyword The categorized importance of the keyword candidates extracted by the extraction means is read from the categorized importance dictionary, and is input based on the categorized importance of the keyword candidates and the information included in the keyword statistical information of the keyword candidates. Input means provided with a classification determining means for determining the classification to which the document information that has been registered belongs. A device for classifying document information. 28. A plurality of second headwords, related words related to each of the second headwords, and a degree of relevance indicating a degree of relevance between the second headwords and the related words are registered in advance. The related keyword dictionary is further provided, and the keyword statistical information creating means reads out the related word and the degree of association from the related word dictionary for each of the keyword candidates extracted by the keyword extracting means, and reads out one keyword candidate. If the same word as the related word is present in another keyword candidate, at least a part of the keyword statistical information of the one keyword candidate is shared based on the keyword statistical information of the other keyword candidate and the read degree of association. The device for classifying the input document information according to claim 27, which is adapted to make a chemical modification. 29. A plurality of first headwords and, for each of the first headwords, the classification importance for each category to which the classification importance is registered in advance in the classification importance dictionary, and the input document information. Is received, the keyword candidates are extracted from the input document information, keyword statistical information regarding the extracted keyword candidates is created, and the classified importance of the extracted keyword candidates is read from the classified importance dictionary, A method for classifying input document information, wherein the classification to which the input document information belongs is determined based on the importance of the keyword candidates by classification and the information included in the keyword statistical information of the keyword candidates. 30. A plurality of second headwords, a related word related to each of the second headwords, and a degree of relevance indicating a degree of relevance between the second headword and the related word are stored in a related word dictionary. For each of the extracted keyword candidates that have been registered in advance, the related word and the degree of association are read from the related word dictionary, and if the same word as the read related word for one keyword candidate exists in another keyword candidate, 30. The input according to claim 29, wherein at least a part of the keyword statistical information of the one keyword candidate is shared based on the keyword statistical information of the other keyword candidate and the read degree of association. How to classify document information.