An X-ray diagnosis apparatus comprising: an imaging unit comprising an X-ray tube and a detector configured to obtain a first X-ray image and a second X-ray image associated with a subject in which a medical tool is inserted, said first X-ray image depicting said medical tool and being acquired after injection of contrast medium, and said second X-ray image depicting said medical tool and being acquired at the stage of treatment after the acquisition of said first X-ray image and without any contrast medium, wherein a first electrocardiographic phase is associated with the first X-ray image and a second electrocardiographic phase is associated with the second X-ray image and the first electrocardiographic phase corresponds to the second electrocardiographic phase; a first specifying unit configured to specify a first reference point on a first medical tool area included in the first X-ray image; a designation unit configured to designate a first objective point on the first X-ray image; a first calculation unit configured to calculate a relative positional relationship between the first reference point and the first objective point;a storage unit configured to store the relative positional relationship in association with the first electrocardiographic phase; a second specifying unit configured to specify a second reference point on a second medical tool area included in the second X-ray image; a second calculation unit configured to calculate a position of a second objective point on the second X-ray image based on the relative positional relationship stored by the storage unit and the second reference point; and a display unit (38, 40) configured to display the second X-ray image while highlighting the position of the second objective point. an imaging unit comprising an X-ray tube and a detector configured to obtain a first X-ray image and a second X-ray image associated with a subject in which a medical tool is inserted, said first X-ray image depicting said medical tool and being acquired after injection of contrast medium, and said second X-ray image depicting said medical tool and being acquired at the stage of treatment after the acquisition of said first X-ray image and without any contrast medium, wherein a first electrocardiographic phase is associated with the first X-ray image and a second electrocardiographic phase is associated with the second X-ray image and the first electrocardiographic phase corresponds to the second electrocardiographic phase; a first specifying unit configured to specify a first reference point on a first medical tool area included in the first X-ray image; a designation unit configured to designate a first objective point on the first X-ray image; a first calculation unit configured to calculate a relative positional relationship between the first reference point and the first objective point;a storage unit configured to store the relative positional relationship in association with the first electrocardiographic phase; a second specifying unit configured to specify a second reference point on a second medical tool area included in the second X-ray image; a second calculation unit configured to calculate a position of a second objective point on the second X-ray image based on the relative positional relationship stored by the storage unit and the second reference point; and a display unit (38, 40) configured to display the second X-ray image while highlighting the position of the second objective point.