PROBLEM TO BE SOLVED : To provide forms, databases and a system, etc., including them which performs grading of undesirable lessees as information offer service to real estate agents, corporate owners and private owners, etc., that is, companies and individuals possessing articles-for-lease who are connected to the server equipment using communication medium equipment, acquires proper information about undesirable lessees from the database, and enables to support their lease management.SOLUTION : This system, while offering information on undesirable lessees, etc., to specified large number of persons, that is, the real estate agents, the corporate owners and private owners identified by authentication after connecting to the server equipment using communication medium equipment, supports the management of house rents, renewal charges, house rent payment dates, renewal charge payment dates, etc., through communication network.