A computer system, having: a storage apparatus having: a storage volume constructed by a physical resource; a host computer having a storage volume assigned from the storage apparatus; management computers having: a first management computer configured to manage the storage apparatus; and a second management computer configured to manage the host computer, the second management computer including: first template information for identifying a change that occurs in the host configuration information; and management subject resource relationship information, the first management computer being configured to notify, before the management operation accompanying the configuration change is carried out for the storage apparatus, the second management computer of a change that occurs in the storage configuration information, the second management computer being configured to identify the change that occurs in the host configuration information based on the change that occurs in the storage configuration information notified by the first management computer.