1. A storage system comprising: an input unit for inputting setting information; one or more controllers for processing the setting information sent from the input unit; and a plurality of disks for storing data in a storage area constituted from a plurality of logical units; wherein each of the controllers includes a plurality of cores that receive an LU ownership in a plurality of processing objects, the logical units, and take charge of processing of the processing objects, and the controller sends and receives data to and from the plurality of disks which are access objects; and wherein the controller extracts, for each processing object, patterns showing the relationship between a core having the LU ownership and a candidate core as a destination of transfer of the LU ownership based on LU ownership management information; measures, for each processing object, the usage of a plurality of resources constituting the controller; predicts, for each processing unit based on the measurement results, a state change that might occur after the transfer of the LU ownership; selects a pattern that matches the setting information of the input unit, from among the respective patterns extracted based on the respective prediction results; and transfers the LU ownership to the core belonging to the selected pattern.