PROBLEM TO BE SOLVED: To relatively easily, conveniently and highly accurately provide information related to pregnancy of women by using a calendar table.SOLUTION: In an electronic calendar system for women, childbearing period storage means stores a childbearing period calculated on the basis of reference ovulation days nB. The reference ovulation days nB are calculated by comparing the number of ovulation days nS stored by specific ovulation day storage means with the number of ovulation days nM stored in detected ovulation day storage means, and setting the smaller number of days between the respective number of days as reference ovulation days of the childbearing period.SELECTED DRAWING: Figure 9
