an nic or an hba in addition in a case where a server is connected using iscsi over ethernet there are an implementation in which the network interface 24 can be seen as an nic from the os and an implementation in which the network interface 24 can be seen as an hba from the os in examples given below in the case of ethernet description will be mainly given for an example case where the network interface 24 can be considered as an nic however the present invention can be also applied to a case where the network interface 24 can be considered as an hba the network interface 24 according to this embodiment includes means for allowing the network identifier of the server 2 to be rewritten from the management server 4 the network identifier rewriting operation is performed before the server 2 is booted the state in which the server 2 has not been booted corresponds to a power standby state in which the cpu 21 of the server 2 is not operating in that state the network interface 24 receives a pdu through the network and rewrites an identifier of the network interface 24 the network interface 24 includes a host interface module 241 an external.