What About Internet Access?
There is a small internet access point on the main road in Narita (Omote-san-do - the one that leads from the city center down to the temple). This is on the right side as you are going down, not far from the "Flyer's Lounge".
Within the airport wireless access is now available almost everywhere. However, to actually use it to access the public Internet you need an ISP. If you haven't signed up in advance you can sign up online with a provider like BizPortal, which charges 500 yen for 24 hours.
If you don't have a wireless card, you can find wired access point (you still need an ISP) For official airport information see Wireless and Cable LAN access.
From Widya Santoso
For Internet access beyond Customs at the outgoing terminals, Yahoo.jp has a room with terminals set up that are free to use. A USB key is used to start access going. Note though that conditions expressely forbid the use of any other USB devices (such as USB hubs, flash memory, mobile phone chargers, etc.) and they appear to be pretty vigilant in monitoring proper use of the terminals.
