The, which went on sale late last summer, includes a modem and an Ethernet adapter, allowing the console to tap into a dial-up or broadband Internet connection for online games.
Initial expectations for the $40 device were modest, especially asto figure out workable business models for providing potentially expensive online services.
Sony is competing with Microsoft, whichfor its Xbox game console in November. Microsoft announced last week that it had signed up more than 350,000 Xbox Live subscribers.
Microsoft ison online play to distinguish the Xbox from competitors. Xbox Live differs from Sony in several major regards: It only works with broadband Internet connections, and all games are hosted by Microsoft, which collects a subscription fee.
Sony is leaving the details to game publishers, many of whom are offering online play as an extra service. Electronic Arts, for example, has had more than 400,000 people sign up to play its "Madden NFL 2003" football game online via the PS2.
David Cole, an analyst for research firm DFC Intelligence, said the 1 million mark is impressive for Sony, especially given the limited online content available for the PS2 to date.
"A lot of the developers have been taking a wait-and-see attitude as far as online support," Cole said. "That 1 million mark is the kind of landmark that will really get their attention...I expect to see a lot more publishers get on board with online content."