1. Cognition and Tone of the Press on the Unification Issue Immediately before the Korean War This study was to critically analyze and evaluate the cognition and tone of the press on the unification issues immediately before the Korean War. For the purpose both quantitative and qualitative analysis was made on the editorials in the Donga Ilbo and the Chosun Ilbo which dealt with the unification issues during the period from the establishment of the 1st Republic of Korea on August 15, 1948 to the outbreak of the Korean War on June 25, 1950. 2. Press Activity toward the South by North Korea during the Korean War : Focusing on the Chosuninmin Bo and the Haebang Ilbo This study was to look into the press policy and the related activities performed by North Korea in the South during the Korean War and to evaluate them. In order to understand the concrete contents of the activities and their characteristics, the two representative newspapers published in the South by North Korea at that times - the Chosuninmin Bo and the Haebang Ilbo - were reviewed and analyzed. 3. Persuasive Communication of Propaganda Leaflets during the Korean War This study is to review the characteristics of propaganda leaflets which were the most representative media for psychological warfare during the Korean War. For the purpose, total 448 leaflets, produced and distributed by US(UN) Forces, the North Korean Army and the Chinese Army during the period were analyzed by 7 categories : production source, main subject of leaflets, target audience, message treatment, used language, message appeal method and message presentation of order. 4. U.S. Broadcasts to Korea during the Korean War : Focusing on the Voice of America Korean Service and the Voice of United Nations Command This study analyzed U.S. Broadcasts to Korea during the Korean War and evaluated their historical meaning and effect. Particularly the review was to the way and policies the VOA Korean Service and the VUNC took at that time, and their relations with Korean Broadcasting System(KBS) as well. In addition it was looked into how the radio audience recognized and listened to these two broadcastings.