A communication apparatus used in a network where data communication is performed includes a priority data information holding section that holds, in advance, QoS setting information corresponding to domain names, where the QoS setting information is necessary to perform QoS settings for data communicated in the network. A control packet snooping section snoops on a DNS packet received from a DNS server, and obtains a domain name contained in the DNS packet. A priority control setting section, when QoS setting information corresponding to the obtained domain name is contained in the QoS setting information held in the priority data information holding section, performs, based on the QoS setting information, a QoS setting for data communication performed by a communication apparatus which is the transmission source of the DNS packet.