An ultrasonic observation apparatus includes: a storage unit that stores a reference spectrum that is obtained based on a frequency of an ultrasonic wave received from a reference reflector a frequency analyzer that calculates a frequency spectrum by analyzing a frequency of the received ultrasonic wave a frequency band setting unit that sets a frequency band that is used to approximate the frequency spectrum calculated by the frequency analyzer a corrected frequency spectrum calculator that calculates a corrected frequency spectrum by correcting the frequency spectrum calculated by the frequency analyzer based on the reference spectrum that is stored in the storage unit and a feature data extracting unit that extracts feature data of the corrected frequency spectrum by approximating the corrected frequency spectrum calculated by the corrected frequency spectrum calculator in the frequency band set by the frequency band setting unit.
