To provide a method and a device for subjecting a film to be treated to a heating treatment effectively by a lamp annealing process, ultraviolet light is irradiated from the upper face side of a substrate where the film to be treated is formed and infrared light is irradiated from the lower face side by which the lamp annealing process is carried out. According to such a constitution, the efficiency of exciting the film to be treated is significantly promoted since electron excitation effect by the ultraviolet light irradiation is added to vibrational excitation effect by the infrared light irradiation and strain energy caused in the film to be treated by the lamp annealing process is removed or reduced by a furnace annealing process.