| 摘要 |
PROBLEM TO BE SOLVED: To enhance the possibility that a user can derive his or her desired information, while reducing the burden to the user during retrieval. SOLUTION: The information retrieval server 20 transmits a retrieval keyword to retrieval engine servers 30A to 30D in response to a predictive retrieval request with the retrieval keyword from a user terminal 10 and extracts duplicate words appearing at least twice, from URL and data included in retrieval results from retrieval engine servers 30A to 30D and selects a prescribed number of predictive retrieval words appearing more times, except the retrieval keyword, out of the extracted duplicate words and transmits the predictive retrieval words to the user terminal 10. The user terminal 10 displays the predictive retrieval words so as to allow them to be selected and adds a selected predictive retrieval word to the retrieval keyword and requests predictive retrieval or normal retrieval to the information retrieval server 20. COPYRIGHT: (C)2008,JPO&INPIT
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