The display control ECU changes the display color of the content in accordance with the display content of the content when displaying the content at a position where the windshield glass of the vehicle is located by the AR glass. Further, when the display color of the content is other than white, the display control ECU sets the display luminance of the border of the content to a second predetermined value or more or sets the brightness of the border of the content to a third predetermined value or more. The display control unit, when the color of the display of the content is white, the display luminance of the border of the content is less than the second predetermined value or is larger than the second predetermined value fourth predetermined value, or the brightness of the border of the content is less than the third predetermined value.