A parking system includes an inventory status storage storing the status of inventory of a bicycle, two-wheeled vehicle, or car, and a control system that controls the status of inventory of the bicycle, two-wheeled vehicle, or car and controls check-in and check-out of the bicycle, two-wheeled vehicle, or car based on data stored in the inventory status storage. The parking system further includes a cooperative control unit for communicating with an external rental operator's server, converting instruction data on check-in and check-out transmitted from the server to commands processable for the control system, and instructing to do check-in and check-out.