To reduce the visual burden of vehicle occupants and make the vehicle occupants exercise enough care by means of the display of vehicle information and operation information by displaying the vehicle information and operation information at high visibility on a display according to a running environment and as the vehicle occupants like.

A first display mode in which vehicle information 22a and operation information 22b are displayed in negative form on a display 12 and a second display mode in which the vehicle information 22a and the operation information 22b are displayed in positive form on the display 12 are provided. A display mode switching function by which either the vehicle information 22a or the operation information 22b is displayed on the display 12 according to the first or second display mode is provided.