The present invention presents a network apparatus and a selective information monitoring method using the network apparatus, which allow a user to monitor only required information (the field information of packets) from all received packets. The network apparatus one or more physical interfaces connected to a monitoring target host and configured to receive network packets from the monitoring target host, and a switch fabric module including a configurable monitoring module configured to perform filtering so that selective information is extracted from the network packets collected through the one or more physical interfaces.