An image processing apparatus includes: a storage unit configured to store tomographic images in relation to the fundus of an examined eye; a detection unit configured to detect a boundary of retinal pigment epithelium and an inner limiting membrane from each of the images and to detect a part where the boundary is discontinuous; a determination unit configured to determine a surface of a sclera model for each of the images by use of the detected boundary and the inner limiting membrane; a generation unit configured to generate a sclera model including an optic papilla periphery by use of the surface of the sclera model and the part where the boundary is discontinuous; a combining unit configured to combine each of the images and the sclera model to generate a combined image; and a display unit configured to display the combined image generated by the combining unit.