Culture mixture is outstanding in today's Korea. This paper deals with phenomena, problems, and government's role in the development of Korean multi-cultural society. This paper focuses on the barrier to entry for the immigrants. The barrier to entry in this paper is the barrier that prevents immigrants from participating in their life world in the equal condition with the original Koreans. This paper tries to calculate social cost of the barrier, which results in \1,400,000-1,700,000 per person in a month approximately. The immigrants are not equal to the cost, which can lead them to be incorporated in a lower class. Therefore it is necessary for the Korean government or the Korean society to help them to live a plain life at least. In order to do so, this paper argues that the immigrants be provided with language welfare, which leads them to walk shoulder to shoulder with the original Koreans. This paper overviews delivery system of the language provision and researches the restructuring of it. The emphasis of this paper is that the best way for the immigrants to walk shoulder to shoulder with the original Koreans is the provision of language provision.