TOKYO - A Japanese civil servant was demoted for logging more than 780,000 hits on pornographic Web sites on his office computer over nine months, an official said Friday.

The man, a Kinokawa city government employee in western Japan, visited porn sites from June 2007 to February 2008, city official Tomiko Waki said. The man's name was withheld.

City officials said the number of hits discovered on his computer's internal log was so high in part because one click on certain types of pornographic sites registers multiple hits.

Despite his frequent porn viewing, none of his colleagues noticed his activities, which he apparently conducted throughout the workday.

"Each desk is set apart from each other," Waki said, adding that the man logged 170,000 hits on porn sites in July alone.

The man's supervisors discovered his extensive porn site visits after his computer became infected with a virus, prompting officials to examine his Web browser's history.

Along with the demotion, he received a 20,000 yen ($190) monthly pay cut, Waki said.