Energy treatment apparatus

An energy treatment apparatus comprising:

• a first power source configured to supply power by which a transducer generates an ultrasonic vibration;
• a second power source configured to supply a high frequency current and a high frequency voltage to a first grasping piece and a second grasping piece;
• a first detecting circuit configured to detect an electrical characteristic relating to the power supplied to the transducer over time;
• a second detecting circuit configured to detect the high frequency current and the high frequency voltage supplied to a portion between the first grasping piece and the second grasping piece over time;
• and
• a processor configured to control the first power source and the second power source, wherein the processor is configured to determine, based on a result of tissue discrimination of a treatment target, a treatment state of the treatment target by selecting between i) a first method of determining whether the electrical characteristic detected by the first detecting circuit exceeds a predetermined value, or ii) a second method of determining both of whether the electrical characteristic detected by the first detecting circuit exceeds a predetermined value and whether a variation of a phase difference of the high frequency voltage and the high frequency current detected by the second detecting circuit is in a converged state.