PURPOSE : A private auction method using real estate information sharing system is provided to easily sell the urgent sale by supplying private auction based on the real estate meditation information sharing system.CONSTITUTION : A real estate information sharing server receives real estate information from a franchise terminal and receives real estate information from a franchise terminal and registers from an affiliated terminal(S41). If the information of the registered urgent sale is requested, the real estate information sharing server refers to the information of the registered urgent sale(S42). The contract request and earnest payment are requested to the successful bidder(S44).COPYRIGHT KIPO 2012