1. An image processing apparatus comprising: a definition reducing section that, based on a received image, generates an image having a lower definition than the received image; a color region extracting section that extracts a color region from the low definition image generated by the definition reducing section; a concealing image generating section that, based on the color region extracted by the color region extracting section, converts the color region into a concealing region for concealing a part of the received image and, generates a concealing image including the concealing region; and an image combining section that combines the received image with the concealing image generated by the concealing image generating section.