TOKYO — A top official hinted Thursday that Japan’s newly installed conservative government might seek to revise a two-decade-old official apology to women forced into sexual slavery during World War II, a move that would most likely outrage South Korea and possibly other former victims of Japanese militarism.

Speaking a day after the new Cabinet was named, Chief Cabinet Secretary Yoshihide Suga, who serves as the government’s top spokesman, refused to say clearly whether the new prime minister, Shinzo Abe, would uphold the 1993 apology, which was issued by the chief Cabinet secretary at the time, Yohei Kono.