A communication device includes a network control device connected to a Public Switched Telephone Network; an interface connected to an IP network; an operations control part configured to set an address corresponding to the Public Switched Telephone Network and another address corresponding to the IP network for an authorizing person who permits transmission; and a system control part configured to implement sending to the address corresponding to the Public Switched Telephone Network. The system control part determines whether sending permission is necessary; e-mail including the address corresponding to the Public Switched Telephone Network is sent to the other address of at least one said authorizing person if the sending permission is necessary; and sending to the address corresponding to the Public Switched Telephone Network is implemented in a case where e-mail including the sending permission from the authorizing person is received.