PURPOSE: To obtain a superior color picture free of color shifting, by preheating electrostatic recording paper prior to processing for the 1st color and shrinking the paper during color copying which uses a planar photosensitive plate.

CONSTITUTION: A movable supporting body 5 supports a photosensitive unit 7, developing device 8, and fixation device 9 and is provided movably from a driving part 6 in directions AB. When the supporting body 5 moves from a position B to a position A during the processing for the 1st color, a fixation lamp 17 is turned on to preheat the electrostatic recording paper 3. Then, the irradiation with the blue picture light of a CRT1 is performed at the position A, a voltage is applied between the photosensitive plate 10 and a back electrode 4 to form a latent image on the electrostatic recording paper, and yellow development is carried out by a developing roll 13a during movement to the position B. Other colors are processed similarly. Consequently, the paper is shrunk by preheating for the 1st color, so color shifting is eliminated to obtain a color picture of good quality.