A home appliance comprising: a first circuit unit including a converter configured to convert an Alternating Current power into a Direct Current power, a first coil, a first modulator/demodulator configured to wirelessly transmit the DC power generated by the converter using the first coil, a first controller configured to control the first modulator/demodulator, and a first communication unit to transmit a data signal to the first modulator/demodulator or convert a signal received from the first modulator/demodulator into the data signal, for data communication; and a second circuit unit including a second coil configured to receive a wireless power transmitted by the first circuit unit, a second modulator/demodulator configured to convert the wireless power received from the second coil, a rectifier configured to rectify an AC power generated by the second modulator/demodulator, and a second controller configured to control operation of the second modulator/demodulator, characterized in that the first modulator/demodulator and the second modulator/demodulator perform bidirectional time-division data communication, wherein the first modulator/demodulator includes: a first capacitor (Ca); a second capacitor (Cb) connected in parallel to the first capacitor (Ca); a first switching element (Sa) having one terminal connected to the second capacitor (Cb) and the other terminal connected to a ground; and a first voltage detector configured to detect a voltage of a first connection point between the first capacitor (Ca) and the second capacitor (Cb), wherein the voltage detected by the first voltage detector is input to the first controller, wherein if a level of the detected voltage of the first connection point corresponds to a first impedance, the first controller is configured to control the first switching element (Sa) to be turned off for transmitting a signal received from the first modulator/demodulator to the first communication unit, and wherein the first communication unit is configured to convert the signal received from the first modulator/demodulator into a first data signal. a first circuit unit including a converter configured to convert an Alternating Current power into a Direct Current power, a first coil, a first modulator/demodulator configured to wirelessly transmit the DC power generated by the converter using the first coil, a first controller configured to control the first modulator/demodulator, and a first communication unit to transmit a data signal to the first modulator/demodulator or convert a signal received from the first modulator/demodulator into the data signal, for data communication; and a second circuit unit including a second coil configured to receive a wireless power transmitted by the first circuit unit, a second modulator/demodulator configured to convert the wireless power received from the second coil, a rectifier configured to rectify an AC power generated by the second modulator/demodulator, and a second controller configured to control operation of the second modulator/demodulator, characterized in that the first modulator/demodulator and the second modulator/demodulator perform bidirectional time-division data communication, wherein the first modulator/demodulator includes: a first capacitor (Ca); a second capacitor (Cb) connected in parallel to the first capacitor (Ca); a first switching element (Sa) having one terminal connected to the second capacitor (Cb) and the other terminal connected to a ground; and a first voltage detector configured to detect a voltage of a first connection point between the first capacitor (Ca) and the second capacitor (Cb), a first capacitor (Ca); a second capacitor (Cb) connected in parallel to the first capacitor (Ca); a first switching element (Sa) having one terminal connected to the second capacitor (Cb) and the other terminal connected to a ground; and a first voltage detector configured to detect a voltage of a first connection point between the first capacitor (Ca) and the second capacitor (Cb), wherein the voltage detected by the first voltage detector is input to the first controller, wherein if a level of the detected voltage of the first connection point corresponds to a first impedance, the first controller is configured to control the first switching element (Sa) to be turned off for transmitting a signal received from the first modulator/demodulator to the first communication unit, and wherein the first communication unit is configured to convert the signal received from the first modulator/demodulator into a first data signal.