1. A computer-aided image diagnostic processing apparatus comprising: a storage unit which stores a medical image representing the inside of a subject; a unit which specifies an anatomical abnormality candidate region included in the medical image; and a generation unit which generates a display image in which the abnormality candidate region is represented as a three-dimensional image based on volume rendering and at least a part of the peripheral region is represented as a cross-sectional image based on the medical image.