PURPOSE: To execute quickly the maintenance of a parking area by grasping the contents of trouble in the parking area simultaneously also in a control center far from the parking area, even if the trouble occurs in the parking area side.

CONSTITUTION: Contents of trouble in each of sensors such as car detection sensors 6 and 7, a number plate identification sensor 8, a temperature sensor 9, and an intruder detection sensor 10, extension and cutting sensors for a chain of an elevator, etc., are sent to a control center from a parking area through a telephone circuit 17. The control center side inputs a counter-measure to a control section 22 from a key board 24 in accordance with the contents of the trouble, and they are sent to a control section 11 of the parking area from a control section 22 through the telephone circuit 17. A countermeasure can be quickly taken against the abnormalities such as trouble, etc., by indicating the countermeasure on a graphic panel 12 by the control section 11, and the quick maintenance can be made.