A multilevel inverter configured to output a 3-phase voltage to a motor, the multilevel inverter including a plurality of serially connected unit power cells forming one phase, characterized in that each of the unit power cells comprising two current sensors (34-1, 34-2) configured to detect an output current of said each of the unit power cells. wherein said each of the unit power cells includes a rectifier configured to rectify an inputted AC voltage to a DC voltage, a DC link capacitor configured to smooth an output voltage of the rectifier, a cell controller configured to generate a PWM (Pulse Width Modulation) signal in response to the voltage level information received from the master controller, an inverter unit configured to convert a DC voltage of the DC link capacitor to an AC voltage to be outputted to the motor in response to the PWM signal of the cell controller, and two current sensors (34-1, 34-2) configured to detect an output current of the inverter unit. wherein the inverter unit includes a first convert unit and a second convert unit, each of the first convert unit and the second convert unit includes two IGBTs (Insulated Gate Bipolar Transistors) connected in series, and the first convert unit and the second convert unit are connected in parallel, wherein two current sensors (34-1, 34-2) includes a first current sensor configured to provide a current detected from the AC voltage output of the first convert unit to the master controller, and a second current sensor configured to provide a current detected from the AC voltage output of the the second convert unit to the master controller, and wherein the cell controller varies a frequency applied to the motor to obtain a starting torque and controls a motor speed at the same time. a plurality of serially connected unit power cells forming one phase, characterized in that each of the unit power cells comprising two current sensors (34-1, 34-2) configured to detect an output current of said each of the unit power cells. wherein said each of the unit power cells includes a rectifier configured to rectify an inputted AC voltage to a DC voltage, a DC link capacitor configured to smooth an output voltage of the rectifier, a cell controller configured to generate a PWM (Pulse Width Modulation) signal in response to the voltage level information received from the master controller, an inverter unit configured to convert a DC voltage of the DC link capacitor to an AC voltage to be outputted to the motor in response to the PWM signal of the cell controller, and two current sensors (34-1, 34-2) configured to detect an output current of the inverter unit. wherein the inverter unit includes a first convert unit and a second convert unit, each of the first convert unit and the second convert unit includes two IGBTs (Insulated Gate Bipolar Transistors) connected in series, and the first convert unit and the second convert unit are connected in parallel, wherein two current sensors (34-1, 34-2) includes a first current sensor configured to provide a current detected from the AC voltage output of the first convert unit to the master controller, and a second current sensor configured to provide a current detected from the AC voltage output of the the second convert unit to the master controller, and wherein the cell controller varies a frequency applied to the motor to obtain a starting torque and controls a motor speed at the same time.