1. A stereoscopic image display system comprising: an image display unit that displays a parallax image composed of a right eye image and a left eye image; glasses having a transmission portion for a right eye transmitting only the right eye image of the parallax image and a transmission portion for a left eye transmitting only the left eye image of the parallax image; an inclination detection unit that detects an inclination of the glasses; a parallax image generation unit that generates the parallax image in accordance with a detection result from the inclination detection unit; and a display unit that displays the parallax image generated by the parallax image generation unit.