To provide a mobile electronic business transaction environment, used by a user at ease by taking security measures which are safer than the conventional one in a case of theft and loss in an electronic business transaction by a cellphone using SIM(subscriber identity module) card.
This electronic business transaction system is provided with the cellphone 2 in which the SIM card 4 is inserted, a host server 3 on-line connected to the cellphone and having a function performing electronic business transaction, and users' information database 1 having a pre-registered combination of a cellphone number and SIM card identification information. When making transaction of the electronic business by on-line connecting to the cellphone, the host server collates the cellphone number and the SIM card identification information with the contents preregistered in the users database and, only when the collation result matches each other, will the value added information be downloaded to the cellphone.
MORIYASU AKIYUKI
NANBU KEIICHI
SATO MASANOBU
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