| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a card with a reversible display function which displays numerical data such as deposit data or transaction amount data in such a way that the data cannot be grasped, even when information displayed in the reversible display part of the card is furtively looked at by a third party and can be used as a card relative to monetary activities, although it cannot be conventionally used because of a security consideration, and also a reversible display method. SOLUTION: Specific numerical data previously set as a reference value are stored in the information recording part of the card having the information recording part and the reversible display part where visible information is repeatedly rewritable with the help of an outer energy. Further, each time a transaction is conducted using the card, the ratio of a cumulative transaction amount to the reference value is calculated by a data processing means and in succession, displayed, in a rewritable mode, in the reversible display part, using the outer energy and through a graph and/or an image.</p> |
