An ultrasound observation apparatus generates an ultrasound image based on an echo signal obtained by converting an ultrasound echo being an ultrasound wave transmitted onto an observation target and reflected by the observation target, into an electrical signal. The ultrasound observation apparatus includes: a first ultrasound processing unit configured to control first transmission and reception processing of an ultrasound wave to the observation target, and generate first image data a second ultrasound processing unit configured to control second transmission and reception processing of an ultrasound wave to the observation target at a frame rate shorter than a frame rate of the first ultrasound processing unit at a timing different from the first transmission and reception processing, and generate second image data and an image synthesis processing unit configured to synthesize the first image data and the second image data to generate display image data.
