1. An image processing apparatus for extracting a to-be-extracted target image portion included in an image targeted for processing, comprising: judging means for judging whether or not a specific image part belonging to the target image portion is included in the image targeted for processing; and confirming means for checking, when the specific image part is judged to be included in the image targeted for processing, whether or not a potential target image portion including the specific image part is equal to the target image portion.