To provide a system for corresponding to a question of a land owner that his/her land is really returned and various needs between the land owner and a user.

In the entire systems of this land utilization system including respective images of a groundwork system, a basic system, a land utilization type condominium, a land utilization type building, a Land utilization type store and a land utilization type detached house as main parts and the images of their derived parts and the contents of the respective images are recorded, an e-mail receiving part C1 receives e-mail M1 from a customer, and a customer information data collecting part C2 collects customer information from the contents of the e-mail M1 of the e-mail receiving part C1. A database managing part C3 stores collected data from the customer information data collecting part C2 in a database, and a data accumulating and analyzing part C4 accumulates and analyzes the customer information from the database managing part C3. A customer information transmitting part C5 transmits the customer information from the data accumulating and analyzing part to a designated place.