The purpose of this article is to understand a conversational structure of radio interview on current affairs by investigating interviewer`s speaking. Formally, An interviewer asks a question to an interviewee and then listens to the answer in order to deliver information on certain facts, events or people to the audience. The turn-taking system of interview shows these facts well. In this paper we get the following fact that an interviewer does more various speech-act than an interviewee does. What is more, the interviewer has the right to choose topics and express his opinions also. Like this, interviewer has control over an interviewee`s talk and conversational structure of interview. In conclusion, these facts suggest that interview deliver not only some facts or information but also more messages than what an interviewee said.