Our country is still continuing a 'consumptive' dispute over independence despite the fact that we celebrated the 70th anniversary of our independence last year. As August 15, the day liberated from the Japanese colonial rule is especially interpreted respectively and differently by politicians including the president, a clue of National Schism is being offered. The purpose of this article is to analyze and re-illuminate the meaning of the independence with limiting its scope to the speeches marking liberation day by the former presidents following the democratization in terms of how this change is shown in the speeches of state leaders. A political speech, especially, a congratulatory message concerning liberation day conjures up a periodic situation that the people had encountered in the past through which a leader in those days proposes a historical perspective, thereby a letter of plea or a means of conversation makes people know which historic mission they should have for the better future. In this respect, a speech on liberation day is a historical record. Thus their data are able to be available to the public by abbreviating the contemporary periodic situation. Also, the speech further highlights a historical significance of the relevant day of national celebration by a leader, Therefore, the contents in the political and historical source awaken people to more historical sense of the mission and the pride. Accordingly, the article analyzed the methods with which the presidents emphasized the relevant historical fact and the claims that they made as for people's historical mission.