Document processing device, item retrieval apparatus and item search method

摘要

PROBLEM TO BE SOLVED: To accurately present useful relevant words to a user. ;SOLUTION: A retrieval means 3 performs retrieval on a retrieval condition inputted by a retrieval condition input means 2. A keyword specifying means 4 takes arbitrary words out of words in a retrieved document as relevant word search words and takes words other than relevant word search words as relevant word candidates. A simultaneous appearance probability calculation means 5 obtains the simultaneous appearance probabilities of relevant word search words in the detected document and one word out of relevant word candidates. A first independent appearance probability calculation means 6 obtains independent appearance probabilities of relevant word search words in all documents. A second independent appearance probability calculation means 7 obtains the independent appearance probability of each word out of relevant word candidates in all documents. A calculation means 8 calculates the product or the sum of independent appearance probabilities of relevant word search words and those of relevant word candidates. A word extraction means 9 extracts words in accordance with the ratios of simultaneous appearance probabilities to the value calculated by the calculation means 8.;COPYRIGHT: (C)2000,JPO