| 摘要 |
PROBLEM TO BE SOLVED: To increase user's convenience by making it easy to carry information needed to reproduce electronized data by recording it on an IC card, and further making it possible to save and erase electronized data recorded on a terminal according to their importance. SOLUTION: The terminal is provided with a memory, the electronized data are recorded and reproduced by the terminal, and a cipher key for reproducing the electronized data is saved on the IC card, so that equipment which is carried is only the terminal and IC card. Further, the memory of the terminal is composed of a nonvolatile memory which does not have its contents erased even when powered off and a volatile memory which has its contents erased when powered off and the memories for recording are changed according to the contents of the electronized data and data of high importance are left in the nonvolatile memory and thus while the electronized data of high importance are left, new electronized data can be always recorded. |
