| 摘要 |
<p>An electronic commerce system, which aids in a purchase and a sale of a commodity, allows the purchase or the sale of the commodity at a more desirable price or under a more desirable condition. This system comprises a registered commodity data storing unit (102) storing a desired sale or purchase price of a commodity, and the information about a change condition and a change price of the desired sale or purchase price, and a unit (21,31,22,32,12,14) changing the price if the information about the change condition or the change price, which is stored in the registered commodity data storing unit, is satisfied. <IMAGE></p> |
