A printer device connects a plurality of stations each having a plurality of data transmission control units which perform data transmission for respective colors of C, M, Y, and K received from an upper level device, and prints transmitted image data of the respective colors. The transmission of image data received from the upper level device is performed to be thinned out in a raster unit in accordance with the number of stations by a plurality of data transmission control units, which controls image data of the same color, from among a plurality of data transmission control units of each of a plurality of stations. A sheet conveying speed is determined in accordance with the number of stations, and the determined conveyance speed is allocated on a conveyance control unit when sheet conveying starts.