Reference part selection objects indicating the position and direction of the reference part of an object are displayed at a plurality of positions together with a body position setting image 3A showing the positional relationship between a scanning unit 10 and the object. Then, when a reference part selection object at an arbitrary position is selected, a body position corresponding to the selected object is set as a scanning condition. In addition, the display is switched to a body position setting image corresponding to the selected object.
