To provide a device capable of simply changing a screen design of a displaying part to meet a personal taste.

With a communicating part 5, specified personal identification information (telephone number) is transmitted to a data base 2 side, a screen design data corresponding to the personal identification information (telephone number) are received from the data base 2, and the received screen design data together with the corresponded personal identification information (telephone number) are stored in a storing part 7. When a driver actually gets in a vehicle, the driver's personal identification information (telephone number) is obtained via the cellular phone 3 and the communicating part 5 owned by the driver, the screen design data corresponding to the obtained personal identification information (telephone number) are read out of the storing part 7, and displayed on the displaying part 10 with the screen design based on the screen design data.