A printer controller performs processing of a print job by a processor which realizes various processings by executing a program, and by a hardware circuit which interacts with the processor. A part of hardware circuit is configured as a determination circuit which determines a type of a packet stored in a memory for reception, on the basis of data in a particular part of the packet. When the packet is determined to be a command packet, the hardware circuit provides the packet for the processor. When the packet is determined to be a data packet, the hardware circuit transfers print data in a data part of the packet to a memory for image processing.