| 摘要 |
PROBLEM TO BE SOLVED: To offer discount service in an electronic shopping system. SOLUTION: A discount ticket 3 converted into data, including an electronic signature, is distributed to a computer system 1 on the side of a purchaser via electronic mail by a computer system 2 on a store side. The discount ticket 3 is added to merchandise order data and transmitted to the computer system 2 on the side of the store by the computer system 1 at the side of the purchaser. The received discount ticket 3 is authenticated, and when it is an authorized one, the amount after the subtraction of the discount is offered to the computer system 1 on the side of the purchaser from the computer system 2 on the side of the store. |
