| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve a problem that it is difficult to quickly confirm whether the opposite party has opened a mail because confirmation has to be separately performed with a telephone, etc., at the time of transmitting a short mail and an e-mail from a conventional portable telephone set. SOLUTION: When a portable telephone set that has received the mail opens the mail, mail opening information is registered in a home location register and transmitted to the portable telephone set of a transmission source for notification. Thus, a user can quickly learn whether the mail has been opened.</p> |
