A device for calculating one or more camera parameters of a camera mounted on a traveling vehicle includes a location information acquisition unit, a road width information acquisition unit, a scenery image acquisition unit, and a camera parameter calibration unit. The device calculates a height of a mount position of the camera and a direction of the camera. The device also converts a scenery image captured by the camera of a scenery including the road on which the traveling vehicle moves into an image that is displayed for navigation.