The radiography apparatus according to the first invention determines the display-location of respective feature points of such frames in-series based on the time-series locations of the feature points (of a plurality of frames), so that such a radiography apparatus can display the moving target object that is set up so as to have an adequate location, direction and size thereof. In addition, a plurality of feature points is extracted, so that the information of the direction and size of the target object (e.g., blood vessel) is maintained, and it is effectively distinguishable whether the target object (e.g., blood vessel) is proximal or distant and the length of the device (e.g., stent) can be understood intuitively from the image. In addition, the alignment is executed using both the locations of a plurality of locations of the marker and a plurality of display-locations, so that the correction image per se that are displayed at the end can be set up so as to have the accurate location and direction.
