PROBLEM TO BE SOLVED : To enable a venture business to gain the credit of business in an early stage, to allow a land owner and a real estate owner to effectively use land and real estate, and to contribute to the development of our country' s industries by promoting a supporting venture businesses.SOLUTION : The owner of a building used for business gives the right to name the building to a tenant who desire to move into the building or a tenant of the building and leases the building. Mediation in a lease contract of the tenant building for business with building naming right is carried out by using a communication means.