PROBLEM TO BE SOLVED: To provide a trend monitoring method, a trend monitoring server program, a trend monitoring client program, and a trend monitoring device, for automatically finding a trend between users while protecting privacy of the users.;SOLUTION: The trend monitoring method includes: a hint receiving step of receiving a partial hint of an identifier of information accessed from a user terminal 2, which is generated based on the identifier of the information; a hint receiving step of collecting partial hints received from a plurality of user terminal 12 to reproduce an identifier of information; and a trend determination step of determining, based on the reproduced identifier of information, a trend of information from the number of accesses to the information.;COPYRIGHT: (C)2012,JPO&INPIT
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