A monitoring apparatus that identifies a failure path in a network including a relay device includes a packet receiving unit configured to receive packets that are transmitted in the network and an identification unit configured to, when deterioration of quality is detected between a transmission source subnetwork and a destination subnetwork of the received packet based on information included in the received packet received by the packet receiving unit, perform a quality measurement on a plurality of packets that are estimated to be routed through different paths among a plurality of transmission paths between the transmission source subnetwork and the destination subnetwork based on a transmission source address or a destination address so as to identify which packet is a packet that is routed through the failure path.