At the first display device 3, the symbol image 44 is formed as an arrow mark curved along a trajectory on which the own vehicle is previously noticed to travel with automated driving extending from a position on an overtaking lane 38 in the actual scenery 36 to a position on an adjacent cruising lane 45 being an aimed lane. At the second display device 4 as well, the symbol image 44′ is formed as an arrow mark curved along a trajectory on which the own vehicle is previously noticed to travel with automated driving extending from a position on an overtaking lane 38′ in the taken scenery 39 to a position on an adjacent cruising lane 45′ being an aimed lane.