The present invention relates to a system and method for an real estate trade-in comprising : an existing real estate owner terminal (100) which is connected to the internet, and through which existing real estate information desired to sell and stock real estate information desired to buy are inputted; a stock real estate owner terminal (200) which is connected to the internet, and through which stock real estate information desired to sell and a bid for the received existing real estate are inputted; a real estate trade-in server (200) which is connected to the existing real estate owner terminal (100) and the stock real estate owner terminal (200), and controls a real estate trade-in processor; a member database (310) which is connected the real estate trade-in server (200) and in which personal information on registered members is stored; and a trade-in database (320) which is connected to the real estate trade-in server (300) and in which stock real estate information and real estate trade-in contract information are stored.[Reference numerals] (100) Existing real estate owner terminal; (200) Stock real estate owner terminal; (300) Real estate trade-in server; (310) Member database; (320) Trade-in database; (400) Real estate appraisal institute server; (410) Real estate appraisal database; (500) Court registration department server; (510) Court registration department database; (600) Tax office server; (610) Tax office database; (700) Financial institution server; (710) Financial institution database; (AA) InternetCOPYRIGHT KIPO 2014