An ultrasonic observation apparatus includes: a frequency analyzing unit configured to calculate a frequency spectrum by analyzing a frequency of a received ultrasonic wave a feature data extracting unit configured to extract feature data of the frequency spectrum by performing an approximation to the frequency spectrum a storage unit configured to store feature data of a frequency spectrum extracted based upon the ultrasonic wave reflected respectively from plural known specimens, and to store the plural known specimens as being classified into plural groups based upon information of each of the known specimens a degree-of-association calculating unit configured to calculate a degree of association between the feature data extracted by the feature data extracting unit and each group by using a statistics of a population including at least the feature data of each group an image processing unit configured to generate ultrasonic image data having a display manner corresponding to the feature data of the specimen based upon the calculation result of the degree-of-association calculating unit and a display unit configured to be capable of displaying the image corresponding to the ultrasonic image data generated by the image processing unit.
