Our government has signed ceasefire agreements with 13 ethnic armed groups," he said. "We believe we can sign a nationwide ceasefire with all ethnic armed groups soon."
Thein Sein, a former army general who has presided over a series of dramatic reforms since taking office after a general election in2010, gave no exact timetable for the peace deal.
Aun Min, leader of the government's peace negotiating team, said a comprehensive peace could be signed "within three or four months."
He said only one major rebel group, the Kachin Independence Organization, has yet to sign a ceasefire, but has agreed to engage in a political dialogue with the government.
Myanmar has been in an almost constant state of internal warfare since the country won independence from Britain in 1948, with a wide range of ethnic-based rebel groups fighting for independence or some degree of autonomy.