| 摘要 |
A shared-use portable telephone has a ROM section, a RAM section and a control section. The ROM section comprises a password area for holding passwords and a personal information area for holding personal information. The password area includes a plurality of independent password sub-areas that a plurality of users can utilize, respectively, based on their passwords. The personal information area includes a plurality of independent personal information sub-areas which corresponds to the plurality of the password sub-areas, respectively, and which the users can utilize. The control section copies the personal information stored in the personal information sub-areas to the RAM section that the users use in common, and copies the personal information stored in the RAM section to the personal information area of the ROM section. The personal information sub-areas of the ROM section are used independently of each other, one for each user and never for any other user. Every time the shared-use portable telephone is used, the information stored in the RAM section is copied into the specific area of the ROM section. Hence, the personal information is not erased even when the power supply is turned OFF. Each user can access his or her personal information, but cannot access the personal information of the other users. Each user can therefore use the portable telephone, having no risk that his or her personal data item is accessed by the other users. Additionally, the personal information of the users would not be erased.
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