A blood pressure surge is detected from time-series data regarding a blood pressure value. An acquisition unit configured to acquire time-series data regarding a blood pressure value； a calculation unit configured to set one or more peak detection intervals to the time-series data, and calculate a feature amount for each of the peak detection intervals based on one of a systolic blood pressure, a diastolic blood pressure, and a pulse pressure； and a specifying unit configured to specify at least one first peak from the feature amount of each peak detection interval are included.
