Disclosed is a device that displays magnetic fields of at least one magnet in a three-dimensional virtual space. The device comprises: a filming unit for filming the magnet; a virtual space application unit which applies the filmed magnet to a coordinate system of the virtual space based on a preset reference information on the filmed magnet; a magnetic field calculation unit which calculates the magnetic fields generated by at least one virtual magnet applied to the virtual space; and a display unit which displays virtual magnetic fields generated by the virtual magnet by applying the calculation result of the magnetic field calculation unit to the virtual magnet. [Reference numerals] (110) Filming unit; (130) Virtual space application unit; (150) Magnetic field calculation unit; (170) Display unit; (171) First determination unit; (172) Second determination unit
