KEYWORD EXTRACTION METHOD AND KEYWORD EXTRACTION DEVICE FOR DOCUMENT DATABASE, COMPUTER PROGRAM AND PROGRAM STORAGE MEDIUM

摘要

PROBLEM TO BE SOLVED: To precisely specify keywords characterizing each document, and to grasp the contents of each document at a glace in a document database in which a plurality of documents related with a specific field are summarized.;SOLUTION: This keyword extraction method in a document database is provided for making a programmed computer execute a step for acquiring the whole number m of terms included in a document database in which n pieces of documents related with a specific field are summarized and the respective terms T_j(_j=1, 2, 3, ..., m), and for managing the identification of the respective terms T_j, a step for calculating appearance frequency W_ij related with the terms T_i in a document D_i by a predetermined calculation formula, a step for calculating distribution S²_j of the appearance frequency W_ij value concerning the terms T_j, a step for calculating significance V_ij of the terms T_j in the document D_i by V_ij=U_ij×S²_j by using the appearance frequency of the terms T_j in the document D_i as U_ij and a step for preparing and outputting a term list in which the terms T_j are listed up based on the V_ij.;COPYRIGHT: (C)2006,JPO&NCIPI