A system for ablation, comprising: first to third electrodes; first to third ground pads (GND PAD 1, GND PAD 2, GND PAD_3) corresponding to the first to third electrodes respectively; a main amplification unit configured for providing main radio frequency power by amplifying received power; a sub-amplification unit configured for providing sub-RF power by amplifying received power; a first switching unit configured for transmitting the main RF power provided by the main amplification unit to one of the first to third electrodes; a second switching unit configured for transmitting the sub-RF power provided by the sub-amplification unit to one of the first to third electrodes, to which the main RF power is not transmitted; a third switching unit configured for making or breaking connection between the main amplification unit and one of the first to third ground pads; a fourth switching unit configured for making or breaking connection between the sub-amplification unit and one of the first to third ground pads; and a control unit configured for controlling the first to fourth switching units (141, 142, 151, 152) to control one of the first to third electrodes and one of the first to third ground pads by applying a control signal to the first to fourth switching units (141, 142, 151, 152), wherein each of the third and fourth switching units (151, 152) includes three switches (SW7~SW9, SW10~SW12), respectively, corresponding to the first to third electrodes, and one of the three switches (SW7~SW9, SW10~SW12) is turned on for connection to a ground pad (GND PAD 1, GND PAD_2, GND PAD_3) according to the same control signal as that applied to the first and second switching units (141, 142), wherein the control unit is further configured for sequentially applying the main RF power and the sub-RF power to a pair of respective electrodes previously selected from among the first to third electrodes. first to third electrodes; first to third ground pads (GND PAD 1, GND PAD 2, GND PAD_3) corresponding to the first to third electrodes respectively; a main amplification unit configured for providing main radio frequency power by amplifying received power; a sub-amplification unit configured for providing sub-RF power by amplifying received power; a first switching unit configured for transmitting the main RF power provided by the main amplification unit to one of the first to third electrodes; a second switching unit configured for transmitting the sub-RF power provided by the sub-amplification unit to one of the first to third electrodes, to which the main RF power is not transmitted; a third switching unit configured for making or breaking connection between the main amplification unit and one of the first to third ground pads; a fourth switching unit configured for making or breaking connection between the sub-amplification unit and one of the first to third ground pads; and a control unit configured for controlling the first to fourth switching units (141, 142, 151, 152) to control one of the first to third electrodes and one of the first to third ground pads by applying a control signal to the first to fourth switching units (141, 142, 151, 152), wherein each of the third and fourth switching units (151, 152) includes three switches (SW7~SW9, SW10~SW12), respectively, corresponding to the first to third electrodes, and one of the three switches (SW7~SW9, SW10~SW12) is turned on for connection to a ground pad (GND PAD 1, GND PAD_2, GND PAD_3) according to the same control signal as that applied to the first and second switching units (141, 142), wherein the control unit is further configured for sequentially applying the main RF power and the sub-RF power to a pair of respective electrodes previously selected from among the first to third electrodes.