A method and an apparatus are provided for measuring a change in blood pressure caused by respiration control. A number of respirations per minute is measured based on a heart rate when a respiration exercise begins. Respiration of a subject is induced until the number of respirations per minute reaches a predetermined number of respirations per minute. A pulse transit time is calculated during the respiration exercise, a blood pressure value associated with the pulse transit time is calculated, and the blood pressure value is outputted.
