| 摘要 |
<p>To determine the busy degree of the operating frequency channel caused by other systems and enable a user to know an unused frequency channel having a low communication frequency. A first usage-rate measuring unit 40 measures the usage rate of an operating frequency channel, and a second usage-rate measuring unit 42 measures the usage rates of unused frequency channels. When the usage rate measured by the first usage-rate measuring unit 40 exceeds a predetermined value to generate a busy state, a first usage-rate determining unit 44 displays the unused frequency channel having the low frequency rate, which is determined by the second usage-rate determining unit 45, to recommend the unused frequency channel as a switching destination.</p> |
