International film festival means the event where diverse genre of films from all over the world are shown and compete each other, also actors and directors are invited for the interaction and networking between filmmakers in its film market. It offers audiences chances to meet various kinds of films and filmmakers that of interaction and business. Moreover, it develops film as art and industry, and takes a role as a window through which the culture including film in its society matures and develops in general. The key to success in film festival is judged by the view of participants in the group, which decide whether it was successful or insufficient to meet the expectation and plan, and the check point differs in the stages of its process. It can be evaluated by plan, budget, human and material resources, chosen films and filmmakers, and by the practice like the ability to perform and manage it in the period of the festival. Finally after the festival, its assessment can be done by clear accounting and the appraisal by the press, filmmakers, audiences and festival organization itself. The competitiveness of international film festival is summarized as reputation that attracts qualified films and filmmakers, differentiation that reveals clear direction and unique color in its programming, and effectiveness in its management, the composition of its business, and finance. In this point of view, the international film festival by the Seoul government has to secure cultural diversity by introducing art films, independent films, experimental films, classics, and ethnic films which it is hard for citizens and audiences to meet in the theaters. This can help each film festival to enhance the reputation and the authority, and to motivate filmmakers and audiences to participate in the festival spontaneously.