A method and apparatus for measuring a circularly polarized rotating electromagnetic wave using a magnetic field are provided. The method and apparatus are used to measure properties of a circularly polarized rotating electromagnetic wave occurring in nature by using a phenomenon that energy is intensified or attenuated when circularly polarized rotating electromagnetic waves interact. The method and apparatus are used to measure properties of a circularly polarized rotating electromagnetic wave which causes variations in a magnetic field, when circularly polarized rotating electromagnetic waves are radiated into a magnetic field formed by a magnetic body or the flow of electric current, and the variations in the magnetic field are measured as variations in electric current. The method includes the steps of: forming a magnetic field with a permanent magnet or an electromagnet; radiating a circularly polarized rotating electromagnetic wave into the magnetic field; and measuring variations in the magnetic field. The method is also used to measure properties of the circularly polarized rotating electromagnetic wave using a property of the left-circularly polarized rotating electromagnetic wave directing from the S-pole to the N-pole and a property of the right-circularly polarized rotating electromagnetic wave directing from the N-pole to the S-pole. The apparatus includes a magnetic flux meter for measuring variations in the magnetic field caused by the circularly polarized rotating electromagnetic wave radiated from a circularly polarized rotating electromagnetic wave generating source; and a current meter for measuring variations in electric current caused by variations in the magnetic field to thereby measure properties of the circularly polarized rotating electromagnetic wave. Accordingly, the method and apparatus can be used to effectively and simply measure properties of circularly polarized rotating electromagnetic waves existing in nature.