The present invention relates to an electronic commerce system and an electronic commerce method for applying random price discount rate when bargaining is requested. According to the present invention, a purchaser terminal connects to an electronic commerce server and selects a product in a sale site provided from the electronic commerce server. The electronic commerce server checks activation of a bargaining function about the selected product. Under the state that the bargaining function is activated, the electronic commerce server calculates a random price discount rate according to bargaining request, if the electronic commerce server receives bargaining about the selected product from the purchaser terminal. The electronic commerce server informs a calculated price discount rate and a product price applied with the price discount rate to the purchaser terminal. The electronic commerce server processes a product purchase procedure according to the purchase intention of the purchaser terminal about the selected product.;COPYRIGHT KIPO 2014; [Reference numerals] (AA) START; (BB,DD,) NO; (CC,EE) YES; (FF) END; (S101) Access to sale site and process member authentication procedure; (S102) Select goods in sale site; (S103) Bargaining function is activated?; (S104) Request activation about selected goods; (S105) Calculate price discount rate at random; (S106) Request to purchase?; (S107) Process goods purchase procedure; (S110) Re-activate bargaining function of selected goods if fixed condition is satisfied
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