1. An X-ray diagnosis apparatus comprising: a bed on which a patient lies down; a support unit including an X-ray generator configured to emit X-ray to the patient and an X-ray detector configured to detect the X-ray emitted form said X-ray generator; a movement mechanism configured to change a relative position of said support unit to said the patient; a position detector configured to detect the relative position; and a memory configured to acquire an information with respect to the relative position from said position detector at timing of the X-ray emitting and store the information connected to a first X-ray image when the first X-ray image is acquired by emitting X-ray to the patient with changing the relative position in a first direction.