An apparatus for managing a network system including a plurality of components, the apparatus includes a memory that stores component type data of each component of the plurality of components, component relation data including relation information indicating a pair of components related to each other in the network system and error history data including error information of respective error components in the plurality of components. The apparatus includes a processor that executes a procedure including extracting a pair of component type data as a relation class candidate on the basis of the component type data of a pair of error components indicated by the error information in the error history data, the pair of error components being indicated by the relation information.