A vehicle state determining unit (1) for determining a state of a vehicle, a display data output unit (7) for outputting display data for displaying information indicating the state of the vehicle determined by the vehicle state determining unit (1), and an information displaying unit (10) for determining display time of the information from the state of the vehicle determined by the vehicle state determining unit (1) and displaying the information to the outside of the vehicle in accordance with the display data output from the display data output unit (7) during the display time, in which the information displaying unit (10) is configured to switch a display method of the information in accordance with the display time. Thus, a degree of information transmission may be increased.