A communication system contains a protocol converting controller. The controller receives an upstream mobile terminal message from a mobile terminal and converts the upstream mobile terminal message into an upstream Internet message to be used by an Internet server. Also, the controller receives a downstream Internet message from the Internet server and converts the downstream Internet message into a downstream mobile terminal message to be used by the mobile terminal. In one implementation, the downstream Internet message is output by an Internet application and contains an Internet page having mobile terminal data for creating the downstream mobile terminal message. The Internet page contains potentially responsive mobile terminal messages and Internet addresses that respectively correspond to the potentially responsive mobile terminal messages.