A refrigerator, comprising: a power supply unit configured to power the refrigerator using commercial power; a battery coupled to the power supply unit and configured to supply auxiliary power to the refrigerator; a power detection unit coupled to the power supply unit and the battery and configured to detect whether power is being supplied from the power supply unit; a driving unit to provide cold air, the driving unit including a brushless direct current, BLDC, compressor disposed in a machine room, the compressor being a variable displacement compressor operated by the electric power supplied through the power detection unit and being configured such that a rotation rate of the BLDC compressor is adjusted to lower a power when the compressor initially starts, and thus a peak voltage when the compressor initially starts being lowered under the lower voltage to smoothly operate the compressor; and a controller configured to control an operation mode of the driving unit based on the detection at the power detection unit, wherein when the power supply unit is supplying power, the driving unit is controlled to operate in a normal operation mode, and when the power supply unit is not supplying power, the driving unit is controlled to operate in a power failure operation mode and controlling the power to be supplied from the battery; characterized in that, in the power failure operation mode, the driving unit is configured to operate at an input power which is less than an input power in the normal operation mode, and the compressor is configured to be controlled so that an operation time per a unit time of the compressor is shorter than an operation time per a unit time of the compressor in the normal operation mode. a power supply unit configured to power the refrigerator using commercial power; a battery coupled to the power supply unit and configured to supply auxiliary power to the refrigerator; a power detection unit coupled to the power supply unit and the battery and configured to detect whether power is being supplied from the power supply unit; a driving unit to provide cold air, the driving unit including a brushless direct current, BLDC, compressor disposed in a machine room, the compressor being a variable displacement compressor operated by the electric power supplied through the power detection unit and being configured such that a rotation rate of the BLDC compressor is adjusted to lower a power when the compressor initially starts, and thus a peak voltage when the compressor initially starts being lowered under the lower voltage to smoothly operate the compressor; and a controller configured to control an operation mode of the driving unit based on the detection at the power detection unit, wherein when the power supply unit is supplying power, the driving unit is controlled to operate in a normal operation mode, and when the power supply unit is not supplying power, the driving unit is controlled to operate in a power failure operation mode and controlling the power to be supplied from the battery; characterized in that, in the power failure operation mode, the driving unit is configured to operate at an input power which is less than an input power in the normal operation mode, and the compressor is configured to be controlled so that an operation time per a unit time of the compressor is shorter than an operation time per a unit time of the compressor in the normal operation mode.