To make a vehicle such as an electric car loaded with a replaceable battery easily stop at an appropriate stop position without a need of a complicated structure for positioning.
By respectively photographing the periphery and lower part of the vehicle 100 with a plurality of cameras 2 loaded at respective parts including a car body bottom part of the vehicle 100, a navigation device 1 acquires a plurality of photographed images including the image of at least a part of a battery replacement position 201, and composites an around view image indicating the situation of looking down a floor surface around and below the vehicle 100. Then, the battery replacement position 201 is recognized within the composited around view image, and a support image indicating the battery replacement position 201 and the loaded position of a battery 3 in the vehicle 100 respectively is prepared and displayed.
Teruhisa Awata
Sekine
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