A throughput detector 101 detects a throughput R0. A threshold value Rref of the throughput R0 at which a network side can be presumed to be congested is stored in a threshold value storage unit 102. A comparator 103 compares the current throughput R0 with the threshold value Rref. A release request unit 104 requests release of a wireless resource when the throughput R0 falls below the threshold value Rref. In response to the release request, a controller 100 suitably disconnects a physical layer or a logical layer of a wireless section to release the wireless resource. A release term determining unit 105 determines a release term of the wireless resource. A resource request unit 106 makes the released wireless resource be acquired anew after the elapse of the release term to reconnect the wireless communication.