The purpose of this study was to explore newspaper editorials` viewpoints on a mega-event by using semantic network analysis. Fourteen editorial columns of three presses relating to the EXPO 2012 Yeosu Korea, one of the recent mega-events, were selected and analyzed. The selected media are the representative conservative, progressive and economic newspapers in Korean Journalism. In the Chosunilbo. ‘Yeosu’ and ‘Expo’ were strongly networked with ‘host’ and ‘ocean,’ which means that it emphasized on operation and the direct/in-direct effects of the Expo. In the Hankyoreh, ‘Ocean’ and ‘Sea’ were most frequently appeared. It means that it focused on the theme and contents of the Expo. In The Korea Economic Daily, ‘Invitation’ was most frequently stated and was strongly networked with ‘corporate,’ ‘success,’ ‘employment,’ ‘development,’ and so on. It can be said that it stressed economic phenomena. The results of this paper can help to better understand various newspapers’ viewpoints in respect to future mega-events.