An image processing system (1) according to an embodiment includes a stereoscopic display device (132,142), a transform unit (136), an image generating unit (1352,2352,136), and a display control unit (1353). The transform unit (136) reduces or enlarges volume data which is three-dimensional (3D) image data such that among scales of a stereoscopic image assumed to be displayed on the stereoscopic display device (132,142) using a parallax image group obtained from the volume data, a scale in a depth direction on a display surface of the stereoscopic display device (132,142) is substantially the same as a scale in another direction which is a direction other than the depth direction. The image generating unit (1352,2352,136) generates a parallax image group by performing a rendering process on transformed volume data. The display control unit (1353) causes the parallax image group to be displayed on the stereoscopic display device (132,142).
