Obama made the comment in telephone talks with Thein Sein, during which the pair also discussed the US president's visit to Myanmar next month, the White House said yesterday.
"The president welcomed the commitment of Thein Sein and his government to the peace process and said every effort should be made to conclude a national ceasefire in the short term," the statement said.
Obama "underscored the need for an inclusive and credible process for conducting the 2015 elections" and emphasized Washington's "firm commitment to helping the people of Burma achieve a more free, open, and prosperous nation."
Thein Sein convened a meeting today of army top brass and his political rivals including Aung San Suu Kyi -- the first talks of their kind in the country as it moves to emerge from decades of outright military rule.
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The meeting comes just days after Myanmar's election authorities announced the upcoming poll would be held in the last week of October or the first week of November 2015.
Obama also spoke with Suu Kyi about the upcoming elections, and how Washington can "support efforts to promote tolerance, respect for diversity, and a more inclusive political environment," the White House said.
"Obama expressed his appreciation for Aung San Suu Kyi's work to promote a more democratic Burma," it added.
Myanmar's last general elections in 2010 were marred by widespread accusations of cheating and were held without the National League for Democracy or Suu Kyi, the Nobel peace laureate who was kept under lock and key until days after the vote.
Her party is expected to win a good number of seats in the legislature in next year's polls, and parliament will select a president.