PROBLEM TO BE SOLVED: A prospective purchaser actually moves into a model house, examines the specifications of a new building, and can support the design of a building that meets his wishes. Provide a design support program. SOLUTION: A model house information storage device 25 for storing actual model house information, a tenant recruitment application display logic circuit 236 for displaying a screen of a tenant recruitment application on a communication terminal for applicants for residence, and a customer of a prospective purchaser of a building. Design for changing the design data of the selected model house through the customer information storage device 27 that stores personal information, the access authority confirmation logic circuit 231 that gives the access authority to the model house resident communication terminal, and the screen of the design support application A change design drawing creation logic circuit 234 is provided for receiving the change information and creating a conforming design drawing in which the design data of the selected model house is changed. [Selection diagram]
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