FIELD : information technology.SUBSTANCE : system comprises : trader terminals connected via a communication network, a real estate securitisation server for buying real estate, a real estate security transaction server for providing information on the investment security from the real estate securitisation server and information on investment security sale from the trader terminal, an asset evaluation server for providing information on an evaluated price for the real estate corresponding to the investment security to the real estate security transaction server. The method describes operation of said system.EFFECT : high reliability of real estate transactions through real estate securitisation, and selling a plurality of divided securities including a security for ownership and a security for investment.13 cl, 9 dwg