A car management system includes, for example, a second terminal generating first and second tokens in response to a request from a first terminal to use a vehicle, and sending the first token to the first terminal; and a third terminal authorizing the first terminal to use the vehicle by generating an access key that provides authority to use the vehicle using the first token and the second token in response to a request from the first terminal for the access key, and providing the generated access key to the first terminal.