The present invention provides a game system 100, a game terminal 10, and a server device 40. Game system 100 allows players to play a game in a unit of a group constituting one game terminal 10 that has been selected as a parent node requiring a larger bandwidth during the game and at least two game terminals 10 that have been selected as child nodes requiring a smaller bandwidth during the game. The selection of the nodes is performed by server device 40. A parent node is selected from a game terminal 10 that has transmitted a grouping request containing ability data indicating that the terminal has the ability to be selected as a parent node.