PURPOSE : A method and a device for promoting a real estate investment using a trading contract using a computer is provided to promote an investment in real estate by concluding a contract capable of dealing a real estate in a future specific time presently and selling a pre-concluded real estate dealing contract to the third party.CONSTITUTION : Sale ordering data are inputted from a seller computer to a server(1). The sale ordering data are outputted from the server to a buyer computer(2). Purchase ordering data are inputted from the buyer computer to the server(3). Order check requesting data are outputted from the server to the buyer computer(4). The order check requesting data are inputted from the buyer computer to the server(5). The order check requesting data are outputted from the server to the seller computer(6). The order check requesting data are inputted from the seller computer to the server(7).? KIPO 2002