A communication terminal apparatus is provided that is capable of sending and receiving an e-mail, includes an e-mail address storage unit storing recipient information of an e-mail address, a mail analysis unit for analyzing whether the subject area of a received e-mail includes a first prescribed symbol, an e-mail address acquisition unit for acquiring a sender's e-mail address from the received e-mail, and an e-mail address registration unit for registering the sender's e-mail address of the received e-mail with the e-mail address storage unit where the subject area of the received e-mail includes the first prescribed symbol. The communication terminal apparatus advantageously relieves users from cumbersome task of entry of recipients' e-mail addresses and makes the entry of the e-mail addresses accurately stored.