Treatment system 10 includes a high frequency power source 73, a heating power source 83, a jaw 36 which applies a high frequency power (HF) energy and heat (TH) energy to the grasped living tissue, a threshold for ending the application of the HF Nerugi based memory 92 in which data to be acquired is stored in advance, a high-frequency power source 73 as well as the constant power control, a low-impedance time is the time until the impedance of the HF is equal to or greater than a first predetermined value, Based on the thresholds that are obtained by using the data stored in the memory 92, and comprises a HF control unit 74 to terminate the application of the HF energy, and the TH control unit 84 for a constant temperature control of the heating power supply 83,.処置システム10は、高周波電源73と、発熱用電源83と、把持した生体組織に高周波電力(HF)エネルギと熱(TH)エネルギとを印加するジョー36と、HFネルギの印加を終了する閾値を取得するためのデータが予め記憶されるメモリ92と、高周波電源73を定電力制御するとともに、前記HFのインピーダンスが第1の所定値以上になるまでの時間である低インピーダンス時間をもとに、メモリ92に記憶されているデータを用いて取得する閾値に基づき、HFエネルギの印加を終了するHF制御部74と、発熱用電源83を定温制御するTH制御部84と、を具備する。
