A refrigerator and its compressor operating method leading to suppression of leakage current attributed to coolant sleeping at the initial operation of a compressor and obviating the need of another preheater. In the method of operating a compressor (21) of a refrigerator (1), the initial operation the compressor (21) of the refrigerator (1) after its installation is performed with a carrier frequency lower than that in normal operation, and the normal operation is performed with a normal operation frequency carrier frequency.