1. A medical image processing system, comprising: an angiographic image acquisition unit configured to acquire an angiographic image on a region including a blood vessel; a volume data generation unit configured to three-dimensionally reconstruct the angiographic image to generate volume data; a vessel extraction unit configured to extract blood vessels on the basis of the volume data; a sorting unit configured to sort collateral circulations and ischemic blood vessels on the basis of the blood vessels; and an image synthesis unit configured to apply different image processes to the collateral circulations and the ischemic blood vessels, and to generate a synthesized image.