HONG KONG — A Japanese journalist who went missing in Syria three years ago and who is believed to be a hostage of terrorists appeared in a new video aired on Japanese television on Friday.

Jumpei Yasuda, a freelance reporter who often covered war zones, disappeared after traveling to Syria from Turkey in 2015, intending to cover the Syrian civil war. He was believed to have been taken hostage by the Nusra Front, which now calls itself Hay’at Tahrir al-Sham, a group known to capture foreigners for ransom.

Nippon News Network said it had obtained the video from a person connected to Hay’at Tahrir al-Sham, whom it would not name, who told the network that it had been recorded by the group that captured Mr. Yasuda. Another channel that obtained the video, ANN News, would not identify its source.

Neither channel broadcast the entire video.

Tarik Abdul Haq, a Syrian who has said he is in contact with Mr. Yasuda’s captors, said in an exchange through Facebook Messenger that he had handled the sale of the video to Japanese channels for a commission, but declined to name his source.