1. An in-vehicle display apparatus in a vehicle, comprising: a virtual image display device to permit a windshield or a combiner to reflect a predetermined light towards an eye of a driver of the vehicle to display a picture, the virtual image display device displaying the picture in a displayable region as a virtual image appearing ahead of the vehicle; a region recognition circuit to recognize a target plane region in scenery ahead of the vehicle, the target plane region being a continuous region having (i) a flatness equal to or greater than a predetermined threshold flatness and (ii) an area size equal to or greater than a predetermined threshold area size; and an image output circuit to cause the virtual image display device to display the virtual image in the displayable region such that a driver of the vehicle views the virtual image in the target plane region recognized by the region recognition circuit.