| 摘要 |
<p>An IC card comprises a central processor unit (6) executing a sequence of processing steps according to an internally stored operation program which is alterable, and a memory (4) storing operation program alterability/non-alterability information indicating whether the operation program is alterable or non-alterable and collation information referenced to permit change-over of the operation program alterability/non-alterability information between an alterable mode and a non-alterable mode. When coincidence between the collation information and externally applied input information is detected, the operation program alterability/non-alterability information is changed over to its alterable mode, and alteration of the operation program is executed because the operation program alterability/non-alterability information is now in the alterable mode.</p> |
