✔ 最佳答案
there are 2 meeting points at T2, your friend can take the free shuttle bus from T1 to T2 and wait you at one of the meeting points you both have agreed. It normally takes an hour to clear the immigration, so your friend doesn't need to wait for very long and there are vending machines for drinks and shops, your friend won't feel bored.
shuttle bus between terminal:
http://www.narita-airport.jp/en/access/terminal/index.html
meeting points at T2:
http://www.narita-airport.jp/en/guide/service/list/svc_29_t2.html