This study aims to understand the overall perception of the South Korean national baseball team in the 2023 World Baseball Classic (WBC) and provide insights for improving public perception and marketing strategies for the WBC tournament. Using the TextoM big data processing solution, various analyses were conducted on data collected from Naver, Daum, and Google during different WBC phases. The research findings are as follows: Firstly, keyword analysis revealed that before the WBC opening, the predominant keywords revolved around information about the South Korean national baseball team, training, broadcasting, while during the WBC tournament, the focus shifted to participating countries, players, match schedules, and results. After the WBC's conclusion, keywords were related to tournament information, the start of the professional baseball season, and team performance issues. Secondly, network visualization and CONCOR analysis unveiled distinct groupings during different phases. Prior to the WBC opening, there were four groups comprising the South Korean national baseball team, WBC match issues, training, and commentary. During the WBC tournament, five groups emerged, including the South Korean national baseball team, WBC match issues, match results, WBC opening, and national team retirements. After the WBC's conclusion, four groups surfaced, involving the South Korean team's performance, downturn, Asian Games preparation, and match issues. Based on these results, this study aims to contribute to public perception analysis research and the development of the domestic sports industry by suggesting improvements in public perception and WBC activation strategies.