Abstract: A means and apparatus for breaking non-cellular tissues such as cancer cells to be used in medical treatments for human or animal body wherein heat energy is generated due to electric field energy of microelectromagnetic wave radiated from a microelectromagnetic radiator (2) with the use of a magnetron (16) are provided. A cancer cell tissue is radiated with microelectromagnetic wave from the microelectromagnetic radiator (2) composed of the magnetron (16) and an electromagnetic horn (1) and thus active oxygen constituting the cancer cell tissue and electrolytes in the blood acting around the tissue are heated due to the self-vibration by the electrical field energy of the microelectromagnetic wave. Thus, cancer cells are exclusively broken.