PROBLEM TO BE SOLVED: To retrieve a person or a group determined to have relevance with a retrieval word in a designated time when the retrieval word and time are designated.;SOLUTION: A relevance information storage means 71 stores at least the set of a person and a group to be associated with each other and the set of content and a person who has operated the content. A relevance resource registration means 74 repeats reading processing for reading the associated resource from the relevance information storage means 71 with the content received from a client as a starting point, and determines relevance weight information showing the degree of the relevance of a feature word included in the content received from the client and the read resource according to the number of repetitions of the reading processing, and a feature word weight storage means 73 stores the feature word, the read resource, the relevance weight information and date and time information.;COPYRIGHT: (C)2009,JPO&INPIT
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