A management system according to an example of the invention selects a standby combination candidate of an arrangement position candidate of a standby computer and an arrangement position candidate of a standby I/O adapter. The management system specifies a plurality of active combinations of an arrangement position of an active computer and an arrangement position of an active I/O adapter. The management system selects a switch method applicable between the standby combination candidate and each of the plurality of active combinations from a plurality of switch methods. The management system determines a priority of the selected switch method by referring to priority information associating each of the plurality of switch methods and the priority. The management system evaluates the standby combination candidate based on the determined priority of the selected switch method.