The purpose of this study is to examine the difference of public language recognition between public official and civilian by questionnaire survey analysis. I investigated public language recognition through questionnaire survey over 420 person in 45 public institution. As a result, the problem of public language was verified by answer from public language recognition. Although, there are many technical terms and Sino-Korean words in official documents, public official didn``t recognize that. Civilian hope that plain language will be used by official documents. The impossibility of communication in a public language is not the professionalism of an official document but the difference of public language recognition about technical terms maded Sino-Korean words.