To efficiently and effectively display a plurality of pieces of information that can be acquired from measurement data. Measurement data on a spaced amount from a measurement reference plane at each point of a road measured for a predetermined road width along a measurement path of a road to be measured and road image data including the road acquired along the measurement path are acquired; a unit area to become a unit of processing is set based on the measurement data; a model plane in the unit area is set from the measurement data in the unit area; point group data indicating a spaced amount from the model plane at each point of the unit area is generated; spaced amount display data displaying shading or hue corresponding to a spaced amount specified with the point group data in a contour of the road is generated; and a road image based on road image data corresponding to a specified area of the road and a spaced amount image based on the spaced amount display data corresponding to the road image are simultaneously displayed.