PURPOSE : A system for managing lease of a real estate and a managing method thereof are provided to stably supply rent to a lessor and buy a corresponding real estate at a contract price even though a contract period of a tenant ends, thereby minimizing risks due to a change of a real estate price.CONSTITUTION : A real estate lease management system(100) comprises a lease target real estate management unit(110), an under-lease real estate management unit(120), a controller(130) and a database unit(200). The lease target real estate management unit stores data for a lease target real estate in a lease target real estate database(210). After a lease contract period ends, the controller generates a flag to purchase a real estate of a tenant. The controller stores expected purchase price information of a corresponding real estate together with a flag in a contract information database(230).COPYRIGHT KIPO 2010