FIGS. 11A and 11B schematically illustrate screens for prior notice displayed respectively at the first and second display devices 3, 4 in advance in a case that the own vehicle with automated driving performs lane change from an overtaking lane to a cruising lane. A symbol image 44 indicating a travel course for the lane change is displayed at the first display device 3 in addition to the symbol image 37 indicating the scheduled travel course. Similarly, a symbol image 44′ indicating the travel course for the lane change is displayed as well at the second display device 4 in addition to the symbol image 37′ indicating the scheduled travel course. The symbol images 44, 44′ may be displayed instead of the symbol images 37, 37′.