This paper reviews the current situation of 3DTV systems and clarifies issues to be solved in human factors.Several research activities on 3DTV systems are introduced as candidates that may solve such issues. In the second chapter, various 3DTV systems are classified in terms of cues for human three-dimensional perception. The third chapter describes the human factors on the stereoscopic 3DTV system such as visual discomfort and visual fatigue. Chapter 4 describes advanced 3DTV technologies that reproduce multi-viewpoint 3D images and a 3D spatial image.