PURPOSE : A real estate auction type of an electronic commerce system and method having a commerce warranty function is provided to accurately cut off a false bid by attaching auction securities on deposit in case that a member gives up a contract in mid-course after making a successful bid, and by providing the securities to the other person of the member breaking the contract.CONSTITUTION : A member connects to a system server and deposits fixed amount of auction security. A homepage is prepared for the system server. In case that a plurality of purchaser terminals are connected to the system server, the homepage is downloaded. Each purchaser searches lists of articles for sale. Each purchaser participates in an auction and presents bidding prices. In case that the system server selects the highest price and informs the purchasers of the price, the purchasers change the bidding prices. The purchaser who presents the highest price is selected as a successful bidder. The system server makes out a standard contract and informs a seller and the successful bidder of making out the contract. The money left is provided to the seller.COPYRIGHT 2001 KIPO