An image processing apparatus including a storage unit, a correction unit, and an output unit. The storage unit stores moving-image data including a plurality of frames captured by an image-capturing device communicable with the image processing apparatus, time-series data of an inclination angle with reference to a reference direction of the image-capturing device, and time-series data of an angle velocity of the image-capturing device. The correction unit, based on the time-series data of the angle velocity, rotates an image of each of the plurality of frames of the moving-image data to reduce a rotational distortion around the reference direction within a prescribed frequency range. The output unit outputs image data of the rotated image of each of the plurality of frames to an external device communicable with the image processing apparatus.