PROBLEM TO BE SOLVED: To solve the problem that a popularity value is simply added, a case which does not conform to the latest reliable data occurs, and personal attack and a group operation for intentionally making the popularity value of a specific member higher or lower can not be prevented even when they are caused in the conventional technology.;SOLUTION: In an auction system capable of being connected with a plurality of user terminals via a network, for accepting sale or bid from the user terminals, and for providing auction service to a user, a purchaser can decide purchase by referring to popularity data of a seller on the basis of transaction results and after a transaction, the system side decides the addition of the seller and an evaluation value of the seller to the evaluation data on the basis of popularity permission data. The auction system has a popularity function for controlling the evaluation value in consideration of the transaction results and time data. The system performs the selection of a popular person on the basis of strength of mutual relation between users to be obtained from the evaluation value after the transaction and the number of transactions.;COPYRIGHT: (C)2004,JPO
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