| 摘要 |
PROBLEM TO BE SOLVED: To satisfactorily manage retention period. SOLUTION: Setting means of the respective storage periods such as one day, 10 days, one month, one year are displayed, and the displays are called stamps. The display in Figure C is created, for example, by performing input operations of the stamp of one month of the setting means three times, three graphics close to the stamp of one month are displayed on the upper part of an electronic mail and a retention period of three months is displayed. Furthermore, when the above electronic mail is called out, for example, 2.5 months later from a state that the retention period is set as illustrated in Figure C, display at this time is performed, for example, as illustrated in Figure D. In this case, size of the graphics to be displayed is constituted so that it gradually becomes smaller according to length of the remaining retention period. Thus, the remaining retention period is easily grasped by a user and the electronic mail is satisfactorily managed.
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