PURPOSE: To achieve high speed and besides to enable dot density to be elevated, by a method wherein a temperature is elevated by irradiating a heat-sensitive semiconductor layer locally with light on a base material with a specific electric signal, and current is further applied to the temperature increased part.

CONSTITUTION: A transparent electrode layer 2' is adhered onto a heat-sensitive semiconductor layer 3, and heat-sensitive paper 1 is pressured thereon with a pressure roller 1. A laser beam 6 emitted from a semiconductor laser 10 by a specific electric signal permeates a transparent conductive layer 2 to warm locally the heat-sensitive semiconductor layer 3. At that time, the temperature increased part 5 of the heat-sensitive semiconductor part 3 reaches a transition temperature. Rabid variation in resistance occurs at that part, and electroenergizing operation is generated at the resistant variation part (the temperature increased part 5) by voltage from a bias power source having bean preliminarily established. The beam irradiated part is heated by this electroenergizing operation, and heating energy is transmitted to the heat-sensitive paper 1 to generate coloring operation. When the laser beam 6 is turned off, most of heat of the heating part is transferred to the heat-sensitive paper. Then, the heat-sensitive semiconductor layer also becomes not more than the transition temperature, and electroenergizing operation comes not to be generated. High speed printing and high fine printing can be performed by this structure.