1. A medical image processing system, comprising: a memory configured to store an angiographic image of a region including a blood vessel; and a processing circuit configured to acquire the angiographic image from the memory; three-dimensionally reconstruct the angiographic image to generate volume data; extract blood vessels on the basis of the volume data; sort the blood vessels into at least a collateral circulation and an ischemic blood vessel; apply different filtering processes to the collateral circulation and the ischemic blood vessel; and generate a synthesized image.