| 摘要 |
PROBLEM TO BE SOLVED: To efficiently retrieve the latest information by preparing an index data base by applying indexing processing while efficiently collecting effective information on the network. SOLUTION: An index data base 2 is prepared by applying indexing processing to various kinds of information on the Internet 20 collected by reference requests applied from users A, B and C. When the user D outputs a retrieval request for retrieving any information, index data corresponding to that retrieval request are presented to the user D by referring to the index data base 2 corresponding to the relevant retrieval request. The index data base 2 is provided for correspondently showing the information (such as word expressing information contents) collected by the reference request and a URL applied for collecting the information and index data as the retrieved result to be presented to the user D, who outputs the retrieval request, are made into URL extracted from the index data base 2.
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