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 and game terminals 10 that have been selected as child nodes. The parent node is capable of communicating with each node, and each child node is capable of communicating with the parent node. The selection of the parent node is performed by server device 40. A parent node is selected based on bandwidth notified from each game terminal 10.