The present invention relates to a real estate broker system using a smart phone. The smart phone comprises : a location-based service (LBS) unit for transmitting and receiving a position information signal of a cellular base station and/or a position information signal of a GPS method; a camera unit for interworking with the LBS unit; and application software for a real estate transaction. According to the present invention, image information of a real estate in which photographing location information is tagged or displayed by the LBS is provided for the whole and each detail space of the real estate on the market, thereby guaranteeing reliability of an image of real estate information, preventing a false real estate on the market, and guaranteeing genuineness by verifying that the image is photographed in an actual real right place.(110) LBS unit(120) Camera unit(130) Communication connection(200) Application software(210) Image DB(220) Text DB(230) Upload unit(240) Real estate listing information display unit(AA) Communication network(BB) Communication unit(CC) Power unit(DD) Control unit(EE) Input module(FF) Memory(GG) Display unitCOPYRIGHT KIPO 2017