A storage system, which is configured to separately create a device file corresponding to each device in the system and to access based on a bus number of a bus of a corresponding device connection destination stored in the device file, the device corresponding to the device file, is configured to create a latest bus tree information indicating a connection relationship between each bus and each device in the system, to separately detect, based on the latest created bus tree information, a bus number of a bus of each device connection destination, and to change the bus number of the bus of the corresponding device connection destination respectively described in each device file or to re-create each device file, based on a detection result.