The ruling Liberal Democratic Party held its annual convention Sunday to gear up for the upcoming Lower House general election, vowing to unite under Prime Minister Taro Aso and win one of the toughest battles it has ever faced.

Aso, who is president of the LDP, expressed his determination to lead the party to victory in the election that must be held this year because the terms of Lower House members end in September.

"Out of all of the political parties, the LDP is the only party that can come up with measures to tackle" the current economic crisis, Aso told the convention in Tokyo.