PURPOSE: To prevent a display screen from being reflected on a glass without reducing the visibility of display sections. CONSTITUTION: The lightness of the display color of a background section 31 occupying a large area of the lighting portion of the display screen 30 among the background section 31 and the display sections 32, 33 on the display screen 30 is changed according to an action of an operation switch 23. If the lightness of the display color of the background section 31 is lowered at night, e.g. from a light sky blue to a dark sky blue, the reflection of the display screen 30 on the glass around a cabin 40 can be reduced without deteriorating the brightness of the display screen 30. The chroma or hue of the display color is likewise changed.
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