Since the 1990s, with the continuous advancement of economic globalization, enterprises and other countries have participated in global competition, including not only the competition of hard power such as military and economy, but also the competition of soft power such as social media and national image. This paper analyzes the communication skills of social media and the dissemination of international information in the social media era, discusses the popular construction, formation and shaping of South Korea's national image from the perspective of culture, and analyzes the video and audio. The results show that compared with information news, audio-visual news pays more attention to the social livelihood and cultural topics in South Korea.