Abstract: A rental system using a computer for integrally managing/operating all the rental properties that a rental company holds at high efficiency. The current positions and operating states of rental properties, such as construction vehicles (101, 101, . . . . . ) are grasped in real time and reported to the rental company system (100) through a network (400). A basic server (108) of the rental company system (100) integrally manages the current positions and operating states, the rental state, and the maintenance state of the construction vehicles (101, (101, . . . . . ) and provides them to the server (111) of branch offices. At the branch offices, by using a terminal computer (112), portable telephones (104) that sales persons carries, and PDAs (104), the latest situation of the construction vehicles (101, 101, . . . . . ) is referred to so that rental orders, transfer, and maintenance of the construction vehicles (101, 101, . . . . . ) are conducted.