A medical image diagnosis system according to one embodiment includes a gantry, a couch, a reflecting plate, and a processing circuitry. The gantry is for medical imaging having a bore. The couch movably supports a top plate. The reflecting plate reflects an image output from an image output device. The processing circuitry, in a first case where the image is shown to an observer not through the reflecting plate, outputs a first image signal relating to a first image to the image output device. While in a second case where the image is shown to the observer through the reflecting plate, The processing circuitry outputs a second image signal relating to a second image to the image output device.
