An image processing apparatus includes: an image acquiring unit configured to acquire a lumen image of a living body； an image generating unit configured to generate a plurality of new images by changing at least one of a hue and a brightness of the lumen image to predetermined values based on range information in which a range of at least one of a hue and a brightness is set in advance according to biometric information included in the lumen image； and a learning unit configured to learn identification criteria to perform identification of a subject based on the images.
