A generating method or apparatus can generate an electric power by using a temperature difference. The generating apparatus includes a higher temperature portion, at least one coil, a lower temperature portion, and at least one magnet. Thus, the magnet is heated or cooled by a temperature difference between the higher temperature portion and the lower temperature portion, and the magnetic force of the magnet changes at a predetermined Curie temperature, so that the magnet is movable reciprocally between the iron core of the higher temperature portion and the lower temperature portion by a temperature difference between the higher temperature portion and the lower temperature portion to change a magnetic flux in the iron core and to produce a pulse voltage or current in the coil successively so as to generate an electric power.