An image diagnosis apparatus according to an embodiment includes a judging unit and an output controlling unit. The judging unit judges whether an image taking protocol related to an image taking process performed on a subject and an injection protocol related to the administration of the contrast agent to the subject are consistent with each other, the injection protocol being set by a contrast agent injector configured to administer a contrast agent to the subject. When it has been determined that the injection protocol and the image taking protocol are not consistent with each other, the output controlling unit causes a predetermined output unit to output information indicating that the injection protocol and the image taking protocol are not consistent with each other.
