| 摘要 |
<P>PROBLEM TO BE SOLVED: To accurately search books relating to a field about which a user has no knowledge. <P>SOLUTION: In index word grouping processing (S101), book data is successively read out from a book information database, and index words concerning appearing pages being within a page range corresponding to each title are extracted, and the plurality of extracted index words are defined as an index group. In association degree calculation processing (S102), arbitrary index words are successively read in two by two from index data, and association degree scores indicating an association degree between two read index words are calculated on the basis of co-occurrence information of the index words indicated by index groups. In additional keyword presentation processing (S104), a relevant word database is searched to extract first relevant words or second relevant words agreeing with an input keyword, and an additional keyword to the input keyword is presented from among the extracted first relevant words or second relevant words on the basis of association degree scores. <P>COPYRIGHT: (C)2012,JPO&INPIT |
