A computer unit 71 disposed at a vehicle assembly plant 70 sends to an information providing center 40 chassis number information and MAC address information and phone number information of a communication unit 15 of a vehicle. A computer unit 81 at a vehicle sales shop 80 transmits to the center 40 chassis number information and information representing the number plate of the vehicle. The center 40 registers the sent information pieces as movable-body-specifying information and user-specifying information, respectively. By use of an apparatus 10, a user requests the center 40 to provide information. The center 40 authenticates the movable-body-specifying information and the user-specifying information sent from the apparatus 10, checks whether or not the present location of the vehicle coincides with a predetermined location, and specifies the user. Then, the center 40 provides information to the specified user.