An image processing apparatus for an endoscope includes processing circuitry. The processing circuitry acquires a left image and right image. The processing circuitry generates a three-dimensional display image based on the left image and right image. The processing circuitry sets a first region in a part of the left image or right image. The first region is a region having a blur. The processing circuitry sets a second region in the left image or right image. The second region is a region where the user is performing treatment. The processing circuitry computes an overlapping region between the first region and the second region. The processing circuitry determines whether or not to notify the user based on the overlapping region. The processing circuitry generates information for notifying.