Provided is a performance management system 10 collecting management information which is used for performance management of a storage system 5 including a server 2 on which applications operate, a storage apparatus 3, and a switch 4 which couples the server 2 with the storage apparatus 3. The performance management system collects the management information from multiple resources existing on input-output paths that couple the respective applications with the storage, sets a method of collecting the management information from the resources, monitors occurrence of congestion which is attributable to input-output between the performance management system and the resources for collecting the management information, and collects the management information in accordance with the set collecting method. The collecting method is set in accordance with a processing method of using different timings to collect the management information for the respective input-output paths.
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