Magnetic fields are strong and weak all over the universe, and we live in weak magnetic fields created by a giant magnet called Earth. Humanity has enriched their life by artificially changing the strength of magnetic fields and accurately measuring the magnetic field. Super conductors are used in electromagnets that create strong magnetic fields and measure devices of weak magnetic fields. The technology of manipulating the magnetic field has been greatly developed with the use of superconductors. The map depicts an axis to make the magnetic field strong from the bottom left to the right. The upper part of the map is used in natural fields, magnetic fields in living spaces, and electromagnetic applications using materials other than ultra-conductive materials, and the lower part shows examples of devices and equipment with super conductors.