A vehicle system is provided that performs authentication with a plurality of terminals. The system includes a server that generates a first token and transmits the first token to a first terminal. The first terminal stores the first token and a vehicle verifies the first token using a first encryption key and a first authentication key stored in advance for the first token. A second terminal receives the first token and a second token from the first terminal to be delegated with an authority. The second terminal stores the first token and the second token, and the vehicle verifies the first token stored in the second terminal using the first encryption key and the first authentication key, and verifies the second token stored in the second terminal using a second encryption key and a second authentication key stored in advance for the second token.