A communication apparatus connected to a plurality of IP (internet protocol) networks and conducting packet communication with other communication apparatuses through the plurality of IP networks includes a memory and a controller. The controller conducts the packet communication with the other communication apparatuses and controls bandwidth speeds used by the packet communication with other communication apparatuses according to addressee information of the other communication apparatuses stored in the memory. The memory includes a data-table which registers and correlates the addressee information and corresponding bandwidth speeds of the other communication apparatuses. The controller controls the bandwidth speeds for the other communication apparatuses by referring to the data-table by using the addressee information of the other communication apparatuses. The addressee information of the other communication apparatuses include IP addresses, subnet-addresses of the IP addresses, and alias information of the other communication apparatuses.