Abstract: Disclosed is an electronic commerce system using a jackpot discount rate and providing a price discount service to a customer. To this end, provided is an electronic commerce system using a jackpot discount rate, the electronic commerce system comprising a web server, which analyzes an electronic commerce earnings rate on the basis of purchase information transmitted from a plurality of purchaser terminals, extracts a jackpot discount rate exceeding earnings expected by sales of a bidding product according to an excess earning rate when the earnings rate exceeds a predetermined earnings rate, determines a jackpot price to which the jackpot discount rate is applied, and provides information on the jacket price to the purchaser terminals.