1. An image processing apparatus comprising: a first image obtaining unit configured to obtain a first image of an object in a first shape state; an imaging region setting unit configured to set an imaging region of the object in a second shape state; a deformation information obtaining unit configured to obtain deformation information indicating deformation of the object from the second shape state to the first shape state; a corresponding region calculating unit configured to calculate a corresponding region that corresponds to the imaging region in the first shape state based on the deformation information; and a display image generating unit configured to generate a display image based on the first image and the corresponding region.