초록 ▼

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 transac

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.

대표청구항 ▼

A portable electronic medium, comprising: first memory means for storing term data which relates to an effective time of the medium; second memory means for storing maximum amount data indicating a monetary amount allowed for executing transactions to the medium within the effective time; third memo

A portable electronic medium, comprising: first memory means for storing term data which relates to an effective time of the medium; second memory means for storing maximum amount data indicating a monetary amount allowed for executing transactions to the medium within the effective time; third memory means for storing renewable data indicating a monetary amount for setting new maximum amount data in the second memory means; timer means for generating data relating to time; comparison means for comparing the data generated by the timer means with the term data in the first memory means; and renewal means for renewing the maximum amount data in the second memory means in accordance with the renewable data in the third memory means when the comparison means indicates that the data generated by the timer means exceeds the term data in the first memory means.