The frame interpolation unit 61 generates an interpolation image for interpolating in a non-photographic section that is between one exposure section in which exposure occurs and a next exposure section, with use of photographed images in both exposure sections temporally adjacent to the non-photographing section. The frame compositing circuit 62 generates a composite image corresponding to a predetermined time section with use of a photographed image photographed in the predetermined time section and the interpolation image generated by the frame interpolation circuit 61. 展开▼