PROBLEM TO BE SOLVED : To provide a stabilization system of lease management, particularly an SPC (Special-purpose Company) commodity system having a small risk even when having a vacant room.SOLUTION : The lease management can be successful as a stable business without a risk to a landowner and a financial institution by this system. The system contributes to the development of a business of a specialist or the like such as a construction company, a house maker, a real estate company, a design office or a licensed tax accountant by systematizing a commodity which can be commercialized by the SPC by the system. An electronic mail reception part C1 receives an electronic mail M1 from a customer, and a customer information data collection part C2 collects customer information from the content. A database management part C3 stores the information in a database, and simultaneously a data totalization analysis part C4 totalizes and analyzes them. A customer information transmission part C5 transmits the customer information from the data totalization analysis part to a designated place.