The disputed territory includes the South Korean-controlled islets in the Sea of Japan (East Sea) called Takeshima in Japan and Dokdo in South Korea, and the Japan-held Senkaku islands in the East China Sea, claimed by China as the Diaoyus, the Sports Nippon tabloid reported.
The Russian-held islands off Japan's northern main island of Hokkaido, referred to by Japan as the Northern Territories, are also included, the paper said.
In notices issued earlier this year the Tokyo government said that "some registrations in the electronic maps on the home pages are incompatible with Japan's stance", Kyodo News agency reported.