A control device includes circuitry configured to: generate, based on respective pieces of imaging data obtained by a plurality of imaging devices of a moving body, a three-dimensional image indicating a space including both the moving body and surroundings of the moving bod; and cause a display device to display generated the three-dimensional image. The circuitry is capable of rotation of the space in the three-dimensional image. When it is predicted that a boundary region of the respective pieces of imaging data in the three-dimensional image is present in a specific region at time of stop of the rotation, the circuitry changes the boundary region.