1. An image processing system comprising: a plurality of operation pipelines to operate an inputted image data; a switching channel to switch a data transfer path to input operation results, which are outputted from the plurality of operation pipelines, to the plurality of operation pipeline again; and a control circuit to control switching of the data transfer path by the switching channel and to control an operation in the plurality of operation pipelines, the control circuit carrying out a scheduling of a plurality of operations, which form (n−k&plus;1) unit operations from a unit operation k (1<k<n) to a unit operation n (n is a positive integer) of unit operations 1 to n, the plurality of operations prevented from overlapping with each other at the same predetermined operation time in the same operation pipeline when a unit operation included in the plurality of operations is executed by the plurality of operation pipelines.