An object information processing apparatus is provided for obtaining object information from input image data comprising pixels. The object information processing apparatus comprises an object determination section for determining whether or not each pixel is a part of an object to be extracted by comparing color information indicating a color of the pixel with a predetermined reference value for the object, and an object information retaining section for retaining coordinate data of the pixel as the object information if the pixel has been determined by the object determination section to be a part of the object to be extracted.