A medical image diagnosis apparatus according to an embodiment includes a rendering processing unit, a display unit, and a control unit. The rendering processing unit is configured to perform rendering processing from a plurality of viewpoints on volume data that is three-dimensional medical image data to create a parallax image group composed of a predefined number of parallax images. The display unit is configured to display the parallax image group to display a stereoscopic image recognized stereoscopically by an observer. The control unit configured to perform control so that a composite image group of the parallax image group and an information image is displayed on the display unit in such a manner that a first region displaying the parallax image group on the display unit is distinguishable from a second region displaying the information image indicating information other than the parallax image group on the display unit.