A ranking method and system for providing a ranking of a game friend. The method includes registering a game friend who has joined a game service. The method further includes calculating a ranking of the user with respect to a game friend based on a ranking inquiry request received from the user terminal, and providing the user terminal with the calculated ranking of the user. The user terminal drives a game service platform associated with a plurality of games and provides some information needed for automatic friend registration and the ranking inquiry request information through the game service platform.