In the present invention, when the current value is variable, the difference value (P1-P2) between the active electrode power value (P1) and the current value (P2) of the return electrode is measured, and according to the difference power value (P1-P2) It relates to a high-frequency electrical treatment device and a treatment method capable of inducing effective treatment and treatment by controlling an appropriate frequency output to a patient's affected area by calculating an impedance value.In a high-frequency energy generator and a high-frequency energy generator that generate high-frequency energy A high frequency energy control unit that controls the output of the generated high frequency energy, an electrode unit including an active electrode and a return electrode that receives the high frequency energy whose output is adjusted from the high frequency energy control unit and injects the high frequency energy to the affected area , An active electrode voltage current detector that measures a voltage value V1 and a current value I1 of the active electrode, and a return electrode voltage current detector that measures a voltage value V2 of the return electrode and a current value I2. . On the other hand, the present invention detects the voltage/current of the active electrode and the voltage/current of the return electrode on the affected part of the patient when the current value is variable, and uses the difference value of the power value by the detected voltage/current value. It relates to a high-frequency electrical treatment method for treating and treating the affected area of a patient by calculating the impedance value of the affected area and applying effective high-frequency energy based on the calculated impedance value, and measuring voltage/current values of the active electrode and the return electrode. Step, calculating a difference value (P1-P2) between the active power (P1) and the return power (P2) using the measured voltage/current values o
