1. An X-ray imaging apparatus comprising: an X-ray image acquisition unit configured to acquire X-ray image data of an object using at least one imaging system; a control system configured to control the imaging system to acquire frames of X-ray image data corresponding to mutually different directions by moving the imaging system, at least one of the frames of the X-ray image data being acquired during a movement of the imaging system; and a display processing part configured to generate stereoscopically visible image data based on the frames of the X-ray image data.