In a receiver computer 100, a transmission controller 111 transmits user interface data 171 to a transmitter computer 200. In the transmitter computer 200, a display processing unit 213 causes a user interface for inputting print settings information to be displayed on the screen of a monitor 250, based on the transmitted user interface data 171. When the print settings information is input via an input device 240, a transmission controller 211 transmits color image data 271, color-correction source data 272, and the input print settings information to the receiver computer 100. In the receiver computer 100, a print processing unit 114 carries out a variety of processing operations with respect to color image data, based on the print settings information. A color correction element 118 in the print processing unit 114 carries out a color correction of the color image data using the color-correction source data 272 and color-correction destination data 172 read from a hard disk 170. A printer 180 prints a color image, which is expressed by the contents of the color-corrected color image data. This arrangement enables a printer connected to the receiver computer to print a color image based on the print data transmitted from the transmitter computer via a computer network, even if a printer driver exclusively provided for the printer has not been installed in the transmitter computer.