METHOD, PROGRAM AND APPARATUS FOR DISCRIMINATING IMPORTANT LANGUAGE, DOCUMENT RETRIEVAL APPARATUS AND KEY WORD EXTRACTION APPARATUS

PROBLEM TO BE SOLVED: To accurately discriminate an important language with a retrieval intention of a user sufficiently reflected thereto by assuming that a retrieval word used for a short retrieval condition and considered to be absolutely necessary for retrieval by the user is important even for a long retrieval condition. SOLUTION: A method for discriminating an important language comprises a retrieval condition receiving step of receiving a retrieval condition input by the user (step S401); a retrieval word candidate extracting step of extracting a retrieval word candidate from the retrieval condition received in the receiving step (step S402); and a word importance degree calculation step of calculating the importance degree of the retrieval word candidate extracted in the extracting step (step S404, step S406). COPYRIGHT: (C)2005,JPO&NCIPI