Document classification system, document classification method, and document classification program

A document classification system for acquiring digital information recorded in a plurality of computers or servers, analyzing document information included in the acquired digital information, and classifying documents included in the document information, the document classification system comprising:

• a score calculation unit that calculates a score, which evaluates linkage strength between the documents included in the document information and a classification code that is an identifier used when categorizing the documents, for each of the documents;
• an extraction unit that extracts documents in a specified order on the basis of the calculated score;
• a classification code accepting unit that accepts the classification code assigned by a user to the extracted documents;
• a selection unit that classifies the extracted documents by the classification code on the basis of the classification code and analyzes and selects keywords which appear commonly in the classified documents;
• and
• a search unit that searches the document information for the selected keywords;
• wherein the score calculation unit recalculates the score for each document included in the document information by using a search result by the search unit and an analysis result by the selection unit.

A document classification method for acquiring digital information recorded in a plurality of computers or servers, analyzing document information included in the acquired digital information, and classifying documents included in the document information, the document classification method comprising:

• calculating a score, which evaluates linkage strength between the documents included in the document information and a classification code that is an identifier used when categorizing the documents, for each of the documents;
• extracting documents in a specified order on the basis of the calculated score;
• accepting the classification code assigned by a user to the extracted documents;
• classifying the extracted documents by the classification code on the basis of the classification code and analyzing and selecting keywords which appear commonly in the classified documents;
• searching the document information for the selected keywords;
• and
• recalculating the score for each document included in the document information by using a search result and an analysis result.

A document classification program for having a computer implement:

• an extraction function that extracts a specified quantity of documents, as targets to be classified by a user, from document information;
• a classification code accepting function that accepts a classification code which is an identifier used when categorizing the documents, and is assigned by the user to each of the extracted documents;
• a score calculation function that refers to a database that records keywords selected from the extracted documents on the basis of the classification code, and calculates a score which evaluates linkage strength between documents included in the document information, and the classification code on the basis of the keywords;
• and
• a judgment function that judges whether the number of times of the calculation of the score has reached a specified number of times or not;
• wherein when the judgment function determines that the number of times of the calculation of the score has not reached the specified number of times, the score calculation function recalculates the score on the basis of a result of further extraction, by the extraction function, of a specified quantity of documents, as targets to be classified by the user, from the document information according to the score.