Starting from Toh Lam Seng’s latest book titled “East Asian Journalism”, this study focused on the war responsibility of journalism, which is the key premise of Toh’s journalism history research, current affairs commentary, and journalism education, as well as the substantive domain that facilitates the understanding of contemporary Japan. Before World War II, Japanese journalism focused on the effectiveness of communication with many elites devoting themselves to militarism propaganda. However, after World War II, these elites became key executives in assisting the United States in turning Japan into a democracy with mass communication. However, at that time, a “communication gap” emerged among the general public as a result of ineffective delivery of meanings during the communication process despite the use of language for transmission of information. In order to grasp the history of this period, it is crucial to understand the key role played by the magazine Shiso no Kagaku (1946) and later by the Society for the Shiso no Kagaku (1949). This also constitutes the context in which Toh’s writings can be understood. The conclusion revealed how journalism after World War II became a subject of Japan’s intellectual history, which allows for its effective participation in the historical changes in contemporary cultural construction.