Further increasing digital subscriptions and expanding their reach outside the United States are the keys to success in the rapidly changing newspaper business, a top executive of The New York Times said Friday in Tokyo.

In his talk, titled "Transitioning to a Digital and Mobile World," at the Japan National Press Club in Tokyo, Mark Thompson, president and CEO of The New York Times Company, said its namesake daily topped the 1 million paid digital-only subscriber mark in late July, less than 4½ years after it launched its pay model.

"The fact that we have a million digital subscribers and that the rate at which we add new subscribers is faster now than it was a year ago and two years ago . . . is obviously a pleasing accomplishment for our digital consumer business," Thompson told the packed audience.