Electric energy is supplied to melting/evaporating material (for instance, metal fine wire (6)) to melt and evaporate the melting/evaporating material. An object (for instance, a concrete block (2)) to be broken is broken to the evaporation expansion force. Particles (8) which are discharged from a vessel when the evaporation expansion force is produced are prepared. Alternatively the breaking material (46) in which the melting/evaporating material is immersed is a flammable material and the object is broken by a strong breaking force.
