The Author recognizes the Russo-Japanese War had been observed four kinds of Networks which consisted human communications activities. These networks are: (1) Warring Nations: Sneaked intelligence op-eratives(spies) each other, aiming at collection of information, and execution of domestic disturbance. Motojiro AKASHI was well known as Japanese intelligence operative. A French journalist, named Balais was active in Japan as a Russian spy. (2) Attached officers, reporters, and military experts: sent special reports, analyze and/or forecasted on the military situations. Capt. Pakeenham observed sea battles. Lionel James on SS HAIMUN sent news to the TIMES. Jack London reported the War. (3) Journalists, Novelists and Historians: wrote news stories, commentaries, criticism. Some supported the war, else against. Tolstoy criticized his government. Yosano Akiko wrote a poem against the war. (4) Citizens: read newspapers, journals, sometimes listen to speeches, however, truth was not always informed. Citizens create public opinion.