The case group which is gathering of the case which at least includes with one which shows the feature quantity of the case attribute value and the information of the actual period which is measurement period to phenomenon occurrence being the existence analysis system which calculates the presumption period which is period to phenomenon occurrence on the basis of, in the presumption vessel selective section and the presumption vessel selective section which sort the presumption vessel which it decides, uses for the calculation of presumption whether or not the presumption vessel formation department and the presumption vessel which form the presumption vessel which in every plural actual periods presumes the presence of phenomenon occurrence from attribute value of the case group satisfy specified selective condition, periodIt possesses with the period calculation section which calculates presumption period making use of the presumption vessel which it sorts.
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