This paper is an empirical study of young people's communicative behaviour. So far，we have summarized and criticized many studies of youth culture. In Japan，many sociologists and commentators insist on the importance of categonzing young people as “Joho-Shinjinrui (the new breed of the information age)". They have tried to show that young people have only one communication pattern. They emphasize that the media literacy of all young people is very high，and their personal communication style has a strong influence on their high media-literacy. However，there is no demonstration or empirical analysis which confirms the truth of their argument. In this study，we have tried to describe the real style of young people's communicative behaviour by empirical research. Our main concern is the relation between their personal communication style and media use. We investigated their personal communication style and many styles of media use -singing “Karaoke"，using the telephone，watching TV，playing computer games，and so on. As a result，we can show that young people have many communication patterns. Also，we can suggest that regarding personal communication style，the influence of their media use is very small : if anything，there are more cases of their personal communication style having an influence on their media use.