PURPOSE : An online auction method is provided to enable a user, participating in an internet auction or a real estate auction, to input a wanted purchase price only once, and to make a successful bid at a proper price so that it can enhance an auction efficiency.CONSTITUTION : The method comprises steps of a user selecting an auction product(S100), the user setting a limit purchase price(S200), a user terminal obtaining an average time in response to a signal transmitted to a server(S300), an auction time decision module calculating a betting time for buying the selected product according to the average time(S400), the server determining if the prices of the product, accepted at the auction server system, is under the limit purchase price(S500), the server continuously accepting an auction request signals while the auction price is under the limit purchase price(S600), and the server transmitting a successful bid signal to the user in the case that the accepted price arrives at the limit price(S700, S800).COPYRIGHT 2001 KIPO