Patent attributes
At one of an image supply device storing image data and an image output device performing image processing with respect to the image data which are connected via a communication path through which the image data is communicated, one of a text command described by a markup language and a binary command described by a binary is selected as a command including a control information item for the image processing. From one of the image supply device and the image output device to the other, the selected one of the text command and the binary command is transmitted. At the other one of the image supply device and the image output device, it is performed processing specified by the control information included in the selected one of the text command and the binary command.