| 摘要 |
PROBLEM TO BE SOLVED: To provide an information retrieval apparatus by which a retrieval result is obtained corresponding to a change in the meaning of a word with the lapse of time. SOLUTION: The control section 101 of the information retrieval apparatus 100 makes a keyword extract section 103 extract a keyword regarding an occupation in a sentence collected from a site on the specified Internet by a Web information collection section 102 and to calculate a weight being the degree of association of the keyword with the occupation to write the weight into a keyword history DB (Database) 104. The control section 101 makes an index generation section 106 totalize the weight for every name of the occupation based on the keyword history DB 104 and to store the weight on an Internet index DB 107. The control section 101 makes a retrieval processing section 108 read the names of the occupations from an occupation DB 110 upon receiving the keyword specified by a user, and to return the list of the names of the occupations taking the totalized weight in the Internet index DB 107 into account. COPYRIGHT: (C)2006,JPO&NCIPI
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