PROBLEM TO BE SOLVED : To enhance the satisfaction of a customer by enabling arrangement simulation of furniture and household electrical appliances conforming to a floor plan and to construct a new business model.SOLUTION : After the customer purchases a house from a real estate company 2, the customer links a three-dimensional floor plan of the purchased house with three- dimensional dimensions of products to be treated by a furniture shop 3 and a household electrical appliance shop 4, and dimensions of piping positions of a power source, an air conditioner and a washing machine, etc., on a Web, simulates the arrangement of the furniture and the household electrical appliances conforming to the floor plan, and when they are satisfactory, purchases the furniture and the electrical appliances on-line on the Web. Furniture information DB 32 and household electrical appliance information DB 42 are retrieved by using the furniture, a kind, the dimensions, colors, materials and a price, etc., of the furniture as a retrieval key and applicable data is distributed to a real estate information data base 24. When an order is received on a picture, an instruction is issued from a computer system 21 to the furniture shop 3 and the household electric appliance shop 4 and a written order 52 of distribution is transmitted to a home delivery agency 5 via an IP network 6.