SEOUL, South Korea — Kim Jong-un, the North Korean leader, has removed an official who was widely considered No. 2 in his government from top military and party posts, according to reports in the country’s state-run news media over the weekend.

For the past two years, the official, Vice Marshal Choe Ryong-hae, had been head of the General Political Bureau of the North Korean People’s Army, the second most powerful military post. Mr. Kim is the supreme commander.

Under Mr. Kim, Mr. Choe had gained other powerful posts; he has been a member of the Presidium of the Political Bureau of the ruling Workers’ Party of Korea and a vice chairman of its Central Military Commission.