The purpose of this study is to analyze the use of media language at school and to suggest ways to improve it. The study is mainly focused on ‘Internet language’, which has become one of the most important method of communication in the media language. To accomplish the purpose of the study, we examined the aspects of Internet language use by having surveys and in-depth interviews with middle and high school students and teachers. The materials dealt in this paper include ‘mini-homepage language’, ‘fan-cafe language’, and ‘Internet game language’. Unlike the conventional media language which focuses preponderantly on linguistic elements, Internet language is a notion that includes both the elements of context and the distinctive traits of communication process in cyberspace. Moreover, the fact that a consumer can also be a prosumer in Internet, which is very different from the traditional distribution structure of production-distribution-consumptions, proves that Internet language has become not only a method of communication among individuals, but also a social communicative action like the mass media. From the results of the analysis, it was found that Internet language has an effect on students' daily life communication, and this is an inevitable consequence that results from Internet, a new environment for communication. In addition to that, this phenomenon reveals that the grammar and linguistic etiquette education in the view of protectionism has no actual usefulness. The new communication method through Internet is related to the individual and social responsibility of active participation and management of communication in reality, which are based on correct understandings of communication language in ethical dimension. Therefore, the contents of real communication ethics education for the new media environment should be prepared.