To solve the problem that, in performing electronic commerce using electronic money, some system is already capable of performing personal authentication using body feature data such as fingerprint, with the fear that, when transaction is forced by a stranger, comparatively easily electronic transaction is established.

In performing electronic transaction using electronic money, transaction by the present invention is established depending on whether personal authentication using body feature data is continued for a fixed time or not in the final confirmation processing of transaction, whereby even if the transaction is forced, transaction can be cancelled in the midway thus improving the security in electronic transaction.