PURPOSE : A real estate mediating system is provided to mediate sale information through an information communication network by analyzing conditions of goods of a seller and goods of a purchaser, thereby supplying the sale information to a lessor, a lessee, the seller, and the purchaser. CONSTITUTION : A sale information management server (100) transmits sale target information corresponding to sale goods information, which is received from a seller terminal (200) through an information communication network, to the seller terminal and transmits purchase target information corresponding to purchase goods information, which is received from a purchaser terminal (300), to the purchaser terminal. The seller terminal displays the purchase goods information included in the sale target information corresponding to input of the sale goods information. The purchaser terminal displays the sale goods information included in the purchase target information corresponding to input of the purchase goods information.