To detect a failure in each processor core appropriately. It is provided a network apparatus for transferring a packet, comprising: a control unit; and a network processor including a plurality of processor cores, each configured to perform a process of transferring a packet input over a network. The control unit being configured to: transmit a packet to the network processor; acquire a packet processing status of each of the plurality of processor cores; and monitor a status of the each of the plurality of processor cores based on the acquired packet processing status.