In ancient times, communication was carried out mainly orally or by smoke signals. According to the development of letters, correspondence was made possible and its delivery method was conveyed by Biku Yeokbu who used to work at a station and Yeokbang.

In the case of Korea, the origins of written communication can be traced back to its use by Woyeok in King Sojong's times, the Silla Dynasty and since the foundation of Goryeo, Yeokro was sectioned off into Daero, Jungro, and Soro by consolidating the Woyeok system. Since then, the Yi Dynasty had initiated a post office system by copying from the Myung Dynasty correspondence system. Korea established a modern post and telegraphic system in 1884 and joined the UPU (Universal Postal Union) in 1897. Its operation right was deprived by Japan with an aggressive compulsory agreement, called the "Korea-Japan Communication Pact" in 1900, but along with the restoration of independence, it was normalized. A cabinet meeting had decided on Dec. 4 as the Post & Telegraphic Day in 1956, but again in 1968, the Post & Telegraphic Day was enacted as April 22 to commemorate the Day when the office of postal at the end of the Joseon Dynasty service came into operation. It has taken great strides since then, with international progress and the space station relay which linked Korea with the entire world with the opening to traffic of the Kumsan satellite communication on June 2, 1970 as an impetus. On Mar. 31, 1971, D.D.D was opened to traffic and we came to live by benefiting from communication benefits in one global life circle with an all-weather communication network by satellite revolution's direct communication circuit composition etc. since 1972. In addition, it is developing day by day with international communication's electronic communication and the extension of new-model long-distance automatic telephone circle etc. According to the government's postal law amendment in 1994, MIC was reorganized as MOST, the Bureau of Public Office and the former Minister of Commerce and Industry's information & communication-related functions were integrated so that the information communication industry could be nurtured intensively as a strategic industry of national development and at the same time to cope with the 21st century information society and the Postal & Telegraphic Day was changed to the Day of Information & Communication.