A communication terminal for providing broadcast communication using electronic mail via a network. The communication terminal includes a storing unit configured to store an entry including a mail address and a function mode corresponding to the mail address in an electronic directory, a determining unit configured to determine, based on the entry in the electronic directory, a function mode of a receiver communication terminal, and a transmitting unit configured to transmit image information in a form of broadcast mail to the receiver communication terminal when the determined function mode is a first mode, and to transmit image information in a form of individual mail to the receiver communication terminal when the determined function mode is a second mode.