Importance

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Abstract

The present invention realizes on an electronic shopping system a discount service that makes use of a discount coupon. Electronic data that serves as a discount coupon comprises data for identifying a product to be discounted, data for indicating a discount amount, and an electronic signature, and the like. The discount coupon is provided to a customer computer having as the media electronic mail, an Internet site, CD-ROM and so forth. The customer computer sends the discount coupon together with data indicating the purchase product and purchase quantity when ordering a product at a merchant Internet site. The merchant computer provides a discount service to a customer when the electronic signature of the received discount coupon is valid.

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First Claim