Importance

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Abstract

A portable electronic medium such as an IC card, for example. The IC card incorporates a data memory and CPU and is externally provided with a keyboard and a liquid crystal display. The data memory stores a variety of data which respectively indicates the maximum amount allowed for executing transactions in an effective term, the effective term for transactions, the maximum amount for transactions that can be renewed each effective term, and the effective term between renewals. In addition, the IC card also incorporates a clock circuit which generates data indicating present date. When the card holder enters into a transaction using the IC card, the CPU compares data related to the date with the effective term for transactions. If the CPU identifies from the result of comparison that the present date is out of the effective term for transactions, CPU then automatically renews the effective term for transactions and updates maximum amount allowed for transactions by applying data indicating the effective term applicable to renewal and maximum amount for transactions to be renewed.

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First Claim