In a computer system including server apparatuses such as an active server and a standby server connected to a storage apparatus, when the active server fails, a management server changes over connection to the storage apparatus from the active server to standby server to thereby hand over operation to the standby server. The management server refers to a fail-over strategy table in which apparatus information of the server apparatuses is associated with fail-over methods to select fail-over strategy in consideration of apparatus information of the active and standby servers.