An image processing device comprising a process generation section and a plurality of series-connected operation processing units. Each of the series-connected operation processing units receives a process packet output from the process generation section and performs any processing according to an instruction contained in the process packet. The units are divided into three suites and route selection sections are respectively inserted to input side of each of the suites. If the unit which executes a process related to an input process packet is not included in the immediately following one of the suites, the respective route selection sections supply this corresponding input process packet not to the input side of that one of the suites but to the output side of that suite. The process packet moves as bypassing such a suite as not to have the unit that executes a process related to this process data, thereby reducing its processing time and its power dissipation.