| 摘要 |
An access from a server apparatus to a terminal apparatus is made safely and reliably possible without changing the setting of a firewall, etc. The terminal apparatus 100 sends instruction inquiries 711, 712, to inquire of the server apparatus 200 about existence/absence of a command (an execution instruction) to be executed by the terminal apparatus 100, in a form of an HTTP request (S12). The server apparatus 200 sends reply data 721, 722 (an inquiry response) including the command, in the form of an HTTP response to the HTTP request, to the terminal apparatus 100 (S26, S29) when the command to be executed by the terminal apparatus 100 exists. The terminal apparatus 100 executes the command when the reply data 721, 722 includes the command. |
