| 摘要 |
A communication system includes a server and at least one client. The server includes a first communication unit that performs first communication with each client based on a first protocol, a second communication unit that performs second communication with each client based on a second protocol, an information receiving unit that receives first information with the first communication unit, an information extracting unit that extracts second information, a judging unit that judges whether the second communication is feasible based on the first and second information, and a command sending unit that sends a command for issuing a request for establishing the second communication when the second communication is feasible. Each client includes an information sending unit that sends the first information, a command receiving unit that receives the command, and a request sending unit that issues the request to the first communication unit in response to the command.
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