This invention provides an image processing apparatus which allows an operator to easily recognize relevance between morbid portions, which exist in a plurality of layers, according to a disease. An image processing apparatus according to this invention includes an ophthalmic feature acquisition unit which acquires ophthalmic features as anatomical features of the tomogram, a layer designation unit which designates at least two layers required to detect morbid portions corresponding to a disease of a predetermined type from a plurality of layers specified by the ophthalmic features, a morbid portion acquisition unit which detects morbid portions corresponding to the disease of the predetermined type respectively from the layers designated by the layer designation unit, and a composite display unit which generates a composite image by projecting the morbid portions respectively detected from the layers by the morbid portion acquisition unit onto a predetermined two-dimensional image, and displays the composite image.
