An operation method is proposed to retain parking man-hours and reducing a cost by means of an automatic parking management system using carriers to transport a vehicle. The automatic parking management system, managing parking of vehicles, includes: a simulator that simulates a status of vehicles from boarding and drop-off areas to inside a parking place; and a resource management subsystem that manages a quantity of vehicle carriers; wherein a number of times of use of the parking place is predicted based on usage history of the parking place and the optimum quantity of vehicle carriers to satisfy aimed work efficiency can be calculated by inputting the predicted number of times of use and using the simulator. Additionally, a time of using the parking place for each user is predicted based on the user's parking place usage history, and a movement instruction to change a position of the vehicle within the parking place is issued in accordance with the prediction result.