PROBLEM TO BE SOLVED: To provide a medical image processor which can create information used for the diagnosis of stricturestenosis.SOLUTION: An extraction part 3 extracts first data which indicate a form of the heart from a plurality of respective volume data, and extracts second data which indicate a form of the coronary artery into which a contrast medium flows. The extraction part 3 extracts third data which indicate a form of the coronary artery from the plurality of respective volume data by using the second data. An analysis part 4 acquires a blood flow rate in each region of the coronary artery on the basis of an image value of the coronary artery in a plurality of the respective third data. A color mapping part 5 creates color volume data by allocating a color corresponding to a magnitude of the blood flow rate to each region of the coronary artery. A synthesizing part 6 synthesizes the volume data and the color volume data, and a display image creation part 7 creates image data for display on the basis of the synthesized volume data.
