A control unit of a remote service terminal, for which a contract for using services is still valid, compares data of a vehicle inspection certificate with data in a user database to detect if an owner of a vehicle has changed. When the owner has changed, the control unit notifies the change of data to a management center through a cellular communication unit. The management center retrieves a contractor database based on the notified content to confirm if the owner of the vehicle has changed. When the owner change is confirmed, processing is executed through the remote service terminal to inquire if the contract for using services is canceled or the name of the contractor is changed. The contract is cancelled or the name of the contractor is changed based on a response by the user.