1. An image processing apparatus comprising: a medical image obtaining unit configured to obtain a medical image of an object in a first shape state; a deformation information obtaining unit configured to obtain deformation information indicating deformation of the object from the first shape state to a second shape state; an imaging region setting unit configured to set an imaging region of the object in the second shape state; a deformation image generating unit configured to generate a conversion image by converting the medical image deformed based on the deformation information in accordance with the imaging region; and a display image generating unit configured to generate a display image by overlapping the conversion image and the imaging region.