1. An X-ray imaging apparatus comprising: an X-ray image acquisition unit configured to acquire frames of two dimensional X-ray image data corresponding to mutually different X-ray exposure directions using an imaging system; a reference position acquisition part configured to obtain a spatially criterial direction and a spatially criterial position with reference to the frames of the X-ray image data; and a condition setting part configured to automatically set at least one of a control condition of the imaging system and an image processing condition of an X-ray image, based on information according to the criterial direction and the criterial position.