Provided is a computer which functions as an image processing device which, with each image process module, which executes an image process, of an image process module group in which a plurality of the image process modules are connected in a DAG form, carries out a partial process upon each instance of segmented image data which is obtained by segmenting an inputted image which is represented by inputted image data for each partial region, wherein said computer: imparts a process dependency to the partial processes between the connected image process modules, and imparts a priority to each of the partial processes; arrays the partial processes which have become executable on the basis of the dependency according to the imparted priorities thereof and registers same in an executable partial process list; and executes the partial processes which are registered in the executable partial process list in descending order of priority.