1. A medical image processing apparatus comprising: processing circuitry configured to: extract a living valve image by analyzing 3D image data related to an anatomical part of a subject; specify a distribution of an amount of calcium in the living valve image from CT values of pixels in the living valve image; calculate a distribution of difficulty levels of implanting an artificial valve to the anatomical part in the living valve image based on a comparison between the amount of calcium and a predetermined set value; extract a vessel slice related to the living valve by analyzing the 3D image data; calculate a distribution of calcium in the vessel wall of the vessel slice from CT values of pixels in the vessel slice; and calculate a distribution of implantation difficulty levels for an artificial valve in the vessel wall.