Abstract: A discount system for installment of trade articles and its method is proposed in the present invention. The discount system provides at least a first trade article and a second trade article. When the second consuming end purchases the second trade article after the first consuming end purchases the first trade article, an accumulative value is added by one to record the number of people who purchase the second trade articles. After that, a processing unit calculates a discount price according to the accumulative value so that the installment payment of the first consuming end is reduced correspondingly. Thereby, the profit of marketing the trade articles for the second consuming end is transferred partially to the first consuming end. In this way, the present invention can attract more consumers to purchase the articles.

Abstract: A web transaction system and a method thereof provide an intermediary platform for network transaction. Thereby, the present invention can make a first consumer able to provide a first article information and a self-determined price on-line and automatically perform a intermediary process directed to a second article information provided by a second consumer to exchange the first article corresponding to the first article information and the second article corresponding to the second article information. In addition, the present invention also provides a valuation platform to find out the prices of articles similar to the first article and the second article from preset famous shopping or auction websites and calculate a first reference price and a second reference price. Network consumers can determine the prices of their articles according to the reference prices.