| 摘要 |
A communication system includes a data processing device that communicates with a communication device via a first transmission link. The communication device includes a first communication controller that controls communication with the data processing device via the first transmission link, and a second communication controller that controls communication via a second transmission link which is different from the first transmission link. The communication device also includes a transmitter that transmits transmission data sent via the first transmission link through the second transmission link, a canceller that cancels transmission of the transmission data through the second transmission link upon receiving a canceling command via the first transmission link, and an observer that observes whether the communication via the first transmission link, which transmits the transmission data to the communication device, is enabled, in response to receiving the transmission data via the first transmission link.
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