A refrigerator comprising: a refrigerator body having a freezing compartment and a refrigeration compartment; a cooling circuit including a compressor, a condenser, and an evaporator to cool the freezing compartment and the refrigeration compartment using a first refrigerant; a thermosyphon that includes a pipe for a second refrigerant to flow, the pipe having a first section having a first prescribed shape, a second section having a second prescribed shape, a third section coupled between the first and second sections for the second refrigerant to flow from the first section to the second section, and a fourth section coupled between the first and second sections for the second refrigerant to flow from the second section to the first section; a valve provided at the pipe to open or close the pipe; and a controller configured to control the thermosyphon to operate when the cooling circuit is not operational, wherein the freezing compartment is positioned adjacent to the refrigeration compartment, and the first section of the pipe is positioned at the freezing compartment to undergo heat exchange with the freezing compartment and the second section of the pipe is positioned at the refrigeration compartment to undergo heat exchange with the refrigeration compartment, the first section being positioned higher than the second section, wherein the second refrigerant changes state from a gaseous state to a liquid state in the first section of the pipe and changes state from a liquid state to a gaseous state in the second section of the pipe, and wherein the valve is operated upon receiving power from a rechargeable battery in which a small amount of power is previously charged. a refrigerator body having a freezing compartment and a refrigeration compartment; a cooling circuit including a compressor, a condenser, and an evaporator to cool the freezing compartment and the refrigeration compartment using a first refrigerant; a thermosyphon that includes a pipe for a second refrigerant to flow, the pipe having a first section having a first prescribed shape, a second section having a second prescribed shape, a third section coupled between the first and second sections for the second refrigerant to flow from the first section to the second section, and a fourth section coupled between the first and second sections for the second refrigerant to flow from the second section to the first section; a valve provided at the pipe to open or close the pipe; and a controller configured to control the thermosyphon to operate when the cooling circuit is not operational, wherein the freezing compartment is positioned adjacent to the refrigeration compartment, and the first section of the pipe is positioned at the freezing compartment to undergo heat exchange with the freezing compartment and the second section of the pipe is positioned at the refrigeration compartment to undergo heat exchange with the refrigeration compartment, the first section being positioned higher than the second section, wherein the second refrigerant changes state from a gaseous state to a liquid state in the first section of the pipe and changes state from a liquid state to a gaseous state in the second section of the pipe, and wherein the valve is operated upon receiving power from a rechargeable battery in which a small amount of power is previously charged.