Abstract: A video game system includes a plurality of servers and one or more client terminals. Each server provides game information to the client terminal. The client terminal carries out information communication with the server in accordance with a protocol; carries out the video game on a zone on the basis of the game information; and carries out, in response to a request to change zones, zone changing processing. In the zone changing processing, the client terminal updates a valid flag indicating that the protocol for a current zone is valid to a state indicating that the protocol is invalid; determines whether there is the session information for a new zone or not; and updates the valid flag indicating that the protocol for the new zone is invalid to a state indicating that the protocol is valid in a case where there is the session information.