Livedoor Co. has increased its stake in Nippon Broadcasting System Inc. to more than 45 percent in terms of voting rights, Livedoor sources said Friday.

The figure compares with 42.5 percent as of Feb. 23, according to a report submitted to the Finance Ministry's Kanto Local Finance Bureau by the Internet service provider.

Livedoor is involved in a battle with Fuji Television Network Inc. for a controlling stake in Nippon Broadcasting.