An apparatus according to an aspect of the present invention includes an acquisition unit is configured to acquire a blood pressure value of a subject measured by a blood pressure measurement unit, a first pulse rate of the subject at a normal time, and a second pulse rate of the subject in a time period in which the blood pressure value is measured, a calculation unit is configured to calculate a first tension degree of an autonomic nerve of the subject based on the first pulse rate and to calculate a second tension degree of the autonomic nerve of the subject based on the second pulse rate, and a determination unit is configured to determine a type of blood pressure of the blood pressure value based on the blood pressure value, the first tension degree, and the second tension degree.
