The present disclosure relates to distributed server systems and methods for streaming game service, and in particular, to a distributed server system and method for streaming game service in which an online game is executed for multiple users in a high-performance server computer, and game screens and sounds of multiple users are delivered to client terminals of the multiple users, respectively, by using real-time encoding and streaming. For this purpose, a game service method in a cloud game server includes receiving an access request from a user terminal, receiving unique information about the user terminal, executing a game according to a game event requested by the user terminal, and encoding and transmitting video and audio according to the unique information about the user terminal, where the video and audio is a result of the game execution.