Exemplary communication system 1 includes communication terminal 10, game device 20, and setting management server 30, each of which is connectable to network 50. Communication terminal 10 includes a processing requesting unit configured to request to setting management server 30 execution of processing on game device 20. Setting management server 30 includes a processing instruction unit configured to instruct game device 20 to perform the requested execution of processing. Game device 20 is a communication terminal not always connected to network 50, which device includes a network connection control unit configured to control connection to network 50, and a processing execution unit configured to perform the instructed execution of processing, upon detecting that game device 20, which was not connected to network 50, has been caused to connect to the network by the network connection control unit.