1. An X-ray diagnosis apparatus, comprising: an X-ray generating unit configured to irradiate an X-ray to an object; an X-ray detector configured to detect the X-ray irradiated from the X-ray generating unit; a reference image data creation unit configured to create a plurality of sets of reference image data based on projection data obtained from a plurality of imaging directions to the object after an contrast agent is injected to the object; a fluoroscopic image data creation unit configured to create fluoroscopic image data based on projection data obtained from a desired imaging direction to the object; and a fluoroscopic roadmap image data creation unit configured to create fluoroscopic roadmap image data based on the fluoroscopic image data and reference image data whose imaging direction corresponds to the imaging direction of the fluoroscopic image data.