A push-to-talk/push-to-video based communication system configured to implement a plurality of games, including group games and methods thereof. A game controller in communication over an access network with a push-to-talk/push-to-video server, and plurality of push-to-talk/push-to-video clients implements group games in the PTT/PTV based communication network. Game controller has a first game control apparatus, a game authentication means, a billing apparatus, a second game control apparatus, and a local storage apparatus. A group management server enables receiving and storing of user information and a presence server maintains presence information.