Politics of the Republic of Korea takes place in the framework of a presidential representative democratic republic, whereby the President is the head of state, and of a multi-party system. Executive power is exercised by the government. Legislative power is vested in both the government and the National Assembly. The Judiciary is independent of the executive and the legislature and comprises a Supreme Court, appellate courts and a Constitutional Court. Since 1948, the constitution has undergone five major revisions, each signifying a new republic. The current Sixth Republic began with the last major constitutional revision in 1987.
The head of state is the president, who is elected by direct popular vote for a single five-year term. The president is Commander-in-Chief of the armed force of South Korea and enjoys considerable executive powers.
The president appoints the prime minister with approval of the National Assembly, as well as appointing and presiding over the State Council of chief ministers as the head of government. On 12 March 2004, the executive power of then president Roh Moo-hyun was suspended when the Assembly voted to impeach him and Prime Minister Goh Kun became an Acting President. On 14 May 2004, the Constitutional Court overturned the impeachment decision made by the Assembly and Roh was reinstated.