| 摘要 |
A communication control unit transmits a detection message and receives a reply message with respect to an external device via a communicating unit. A first calculating unit calculates distance to the external device based on time required to receive the reply message. A determining unit determines whether the distance is smaller than a predetermined threshold. When the distance is smaller than the threshold, an establishing unit establishes an encryption invalidated communication with the external device, and a second calculating unit calculates minimum transmission power of a wireless signal to communicate with the external device at the distance.
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