1. An X-ray imaging apparatus, comprising: an X-ray tube and an X-ray detector configured to acquire frames of two dimensional X-ray image data corresponding to mutually different X-ray exposure directions; and processing circuitry configured to obtain a direction and a position of a putting target of an artificial valve to be placed at a valve in a heart or a blood vessel as a spatially criterial direction and a spatially criterial position respectively with reference to the frames of the X-ray image data, and automatically set at least one of a control condition, of the X-ray tube and the X-ray detector, for acquiring an X-ray image used to guide a placement of the artificial valve and an image processing condition for generating an X-ray image used to guide the placement of the artificial valve, based on information according to the criterial direction and the criterial position.