In this paper, we propose a method for segmentation of multiple human in a projection plane. Our algorithm requires a stereo camera system called Subtraction Stereo, which extracts foreground information with a fixed stereo camera. The main contribution of this paper is how the image sequences that include partial occlusion of the foreground objects can be accurately segmented using mean shift clustering in real-time processing. The proposed method is suitable for inside a medium-sized environment, such as a room and an entrance. Finally, we try to segment the image sequences that include partial and full occlusion and show the accuracy of the proposed method.