The purpose of this study was to extend the social comparison theory in an attempt to examine the effect of TV media on adolescent body images. The research was a survey and the subjects were 895 male and female adolescents in Taejon, Korea. The measuring instruments were 2 sets of stimuli of male and female body silhouettes and self-administrated questionnaire. Results were as follows: 1) The subjects TV viewing periods were 3∼4 hours per day and their involvements in TV media were moderate degree. 2) The results of perceptual body images showed that adolescent favored thin body type as an ideal body and had distorting tendency that their bodies were larger than the actual sizes. 3) The results of attitudinal body images showed three factors such as "appearance evaluation", "appearance orientation", and "fitness orientation". 4) TV media had significant effects on perceptual and attitudinal body images. It is concluded that the results of this study support social comparison theory that people compare themselves to others to satisfy their needs for self-evaluation and for judgments of their own personal worth since TV media give strong influence on adolescents through presenting social comparison models to body images.