A communication terminal that includes a first communication unit that is coupled to an IP (Internet Protocol) network and conducts a facsimile transmission through the IP network; a second communication unit that is coupled to a public telephone network and conducts a facsimile transmission through the public telephone network; a control unit that, in a case that a communication error is detected when the first communication unit calls to the IP network and that the address information used for calling to the IP network is the address information corresponding to the destination which is converted from the telephone number received by a reception unit, controls the second communication to call to public telephone network by using the telephone number received by a reception unit.