A management server includes at least one processor including: a monitoring module; and a scheduling module, including the monitoring module is configured to resource information from at least one cluster, and in which the scheduling module is configured to: receive an update request for the at least one cluster, determine an update time point of the at least one cluster based on (i) status information and network performance information included in the resource information and on (ii) a service coverage of a neighboring cluster, and transmit an update specification so as to update network functions of the at least one cluster at the determined update time point.