| 摘要 |
PROBLEM TO BE SOLVED: To intuitively grasp relevancy between associative words when performing associative retrieval concerning a plurality of retrieval words. SOLUTION: A keyword appearance frequency holding part holds appearance frequency data which is obtained by tabulating the appearance frequencies of a plurality of keywords by each kind of document data. A keyword relevance degree holding part holds relevance degree data which is calculated by using the appearance frequency data and expresses the relevance degree based on co-occurrence between the keywords. An associative word selecting part 62 extracts the plurality of keywords as the associative words with respect to the plurality of retrieval words inputted from a user terminal in descending order of relevancy with the retrieval words. A data tabulating part 72 refers to the keyword appearance data so as to acquire the appearance frequencies of the associative words extracted by each document data. A main component analyzing part 74 performs main component analysis with respect to the appearance frequency data, and calculates the prescribed number of main components by each associative word. A coordinate data converting part 76 converts the main component values into coordinate values for arranging the respective associative words in a predetermined map. COPYRIGHT: (C)2009,JPO&INPIT
|
