To promptly suggest a layout of rooms in a house conforming to desires of a customer as if a made-to-order production and to enable drastic reduction of the advertisement cost and the number of salesmen in the case of providing a multiple dwelling house.

When move-in conditions are inputted from a customer terminal 3a, etc., via the Internet 10, a host server 1 extracts a conforming layout among layouts preliminarily recorded in a data base 2 and presents in on the customer terminal, thus, the desires of the customer are delicately and promptly coped with and the drastic reduction of the advertisement cost such as preparation, etc., for a model room and brochures and the labor for dealing with customers is enabled.