An X-ray image diagnosis apparatus allows setting information indicating an object direction in a radiographed image without any errors. This invention is an X-ray detection apparatus which detects X-rays applied to an object and generates a radiographed image of the object. This apparatus includes a unit to display, in a display area, a symbol which has a form corresponding to the object and for which a vector representing a direction as a reference for the symbol is defined, a button to change the direction of the symbol displayed in the display area, and a unit to output information concerning the direction of the vector in association with a radiographed image of the object, when the direction of the symbol displayed in the display area is changed to match the direction of the object with the direction of the symbol displayed in the display area.