A vehicle can have an electronic configuration or a mechanical configuration. In the electronic configuration, a button is operated to start the engine of the vehicle. In the mechanical configuration, a key is inserted in a key cylinder to start the engine of the vehicle. A button signal is output when the button is operated. A key signal is output when the key is inserted in the key cylinder. The configuration of vehicle can be automatically detected based on whether the button signal is output or the key signal is output. An appropriate starting control for the engine is selected based on the configuration of the vehicle.