A medical image diagnosis system according to an embodiment includes a structural image diagnosis apparatus and a nuclear medical image diagnosis apparatus. The system includes a processing circuit that acquires information on a position of a body part of a subject based on a structural image acquired by the structural image diagnosis apparatus and a gantry that scans a nuclear medical image of the subject. The processing circuit controls the gantry based on the information on the position of the body part and a scan condition of the body part.
