To provide a method and an apparatus for thermal recording capable of shortening a recording time and reducing the size of the apparatus.

The method for thermally recording an optical fixing type dichroic recording medium has an image recording layer containing two types of color developing elements for dichroically color developing, by applying different temperatures and deactivating color developing capability by emitting an electromagnetic beam having a specific wavelength corresponding to each color. The method comprises the steps of selectively and simultaneously applying different thermal energizes corresponding to image information of colors to simultaneously image recording with red and black colors of two colors. Thereafter, emitting electromagnetic beam of a specific wavelength for deactivating color developing capability of the color developing elements deactivates color undeveloped color developing elements.