PROBLEM TO BE SOLVED: To provide an electric power sales system capable of encouraging a consumer to purchase excessive electric power and allowing easy settlement of an electric power supply contract on-line between a power supplier and the consumer.;SOLUTION: This electric power sales system is provided with a server 10 connected to a customer terminal 30 via a predetermined network 40 for transmitting/receiving data. By access from the customer terminal 30, the server 10 presents demand data, in which a current demand amount already sold is subdivided by the season and the time when access to power supply is made after a predetermined period from the access time, and according to the demand data, computes a basic fee part of a sales price to the purchase period and the purchase amount designated by the customer terminal 30.;COPYRIGHT: (C)2005,JPO&NCIPI
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