A communication between a terminal connected to the Internet, like a household terminal, and a server can be performed by simple processing at any time after security is ensured. In a case where control of a particular terminal connected to a predetermined network is performed from the server, when there is a predetermined processing request at the particular terminal from the server or an external terminal connected to the server, a callback request is sent to the server or the particular terminal. At the particular terminal receiving the callback request, a callback request response is made to the server by a predetermined communication method in which security is ensured, and instructions for performing predetermined processing by the predetermined communication method are sent, as a response from the server with respect to the callback request response, to the particular terminal.