1. A medical image processing apparatus comprising: a subtraction image acquisition part configured to acquire subtraction image data between X-ray contrast image data and X-ray non-contrast image data of an object; a threshold processing part configured to perform threshold processing of the subtraction image data or image data generated based on the subtraction image data; an image processing part configured to perform image processing of image data after the threshold processing; and an image operation part configured to generate image data for a display by an image operation between the subtraction image data and image data after the image processing.