Abstract: The present invention enables a customer to conduct electronic commerce without divulging confidential information to vendors.

Abstract: The present invention provides an electronic ticket issuing system that allows the easy and rapid transfer of a ticket without the need for user to go to vendor's place of business to receive said ticket or for vendor to mail said ticket to user.

Abstract: An account transaction notification system according to the present invention comprises an account information storage means 114 for storing information about a balance and a transaction, an account information changing means 116 for changing storage contents of the account information storage means 114 so as to corresponds to a change in account information caused by a transaction which changes the account information, an account information change detecting means 118 for detecting the change in the account information, a transaction information preparing means 120 for preparing the information about the transaction, and a transaction information transmitting means 122 for electronically and automatically transmit the information about the transaction to a terminal device for a customer.