APPARATUS FOR CALCULATING EXPECTED DATE OF START OF MENSTRUATION, AND PROGRAM

PROBLEM TO BE SOLVED: To accurately calculate an expected date of start of menstruation according to a type identified by determining whether or not the number of menstrual cycle days of a subject woman is stable, and whether or not the number of high temperature phase days of the woman is stable.SOLUTION: An apparatus for calculating an expected date of start of menstruation acquires the numbers of menstrual cycle days and the numbers of high temperature phase days of a woman over a plurality of menstrual cycles (S1); identifies a type of the woman as a specific type in which the numbers of menstrual cycle days are unstable and the numbers of high temperature phase days are stable, or one of one or more types except the specific type (S2), on the basis of whether or not the numbers of menstrual cycle days of the woman are included within a predetermined range and whether or not the numbers of high temperature phase days of the woman are within a predetermined range; and calculates her expected date of start of menstruation by adding the number of days based on the number of high temperature phase days to her last ovulation day (S6) when her identified type is the specific type, and calculates her expected date of start of menstruation on the basis of her last date of start of menstruation and the number of menstrual cycle days (S4) when her identified type is a type except the specific type. 【課題】被験者である婦人の月経周期日数が安定しているか否か、高温相日数が安定しているか否かのタイプに応じて、月経開始予定日を精度良く算出すること。【解決手段】この発明では、婦人の複数の月経周期にわたる月経周期日数および高温相日数を取得する（Ｓ１）。婦人の月経周期日数が予め定められた範囲に入るか否か、および婦人の高温相日数が予め定められた範囲に入るか否かに基づいて、月経周期日数が不安定であり且つ高温相日数が安定している特定タイプと、特定タイプ以外の１以上のタイプとに分類する（Ｓ２）。分類したタイプが特定タイプの場合には、婦人の最後の排卵日に高温相日数に基づいた日数を加えて月経開始予定日を算出する（Ｓ６）。一方、分類したタイプが特定タイプ以外のタイプであった場合には、婦人の最後の月経開始日と月経周期日数に基づいて月経開始予定日を算出する（Ｓ４）。【選択図】図６