| 摘要 |
PROBLEM TO BE SOLVED: To make it difficult for others to steal a glance at information data without requiring any troublesome locking operation by giving simple secret effect to information data of electronic mail etc. SOLUTION: When a transmission-side portable terminal MS1 sends mail, character data of the mail body are previously divided into blocks each consisting of inputted and set division-unit number of characters, the character blocks are rearranged according to a rearrangement rule, and the mail body after the rearrangement is sent to a destination portable terminal MS2. At this time, conversion control information for restoration is added to the mail header and the reception-side portable terminal MS2 compares conversion control information that a user inputs with the conversion control information received in the header. When the both match each other, the character data of the received mail body are restored according to the inputted conversion control information and displayed.
|
