A signal processing apparatus includes: an acquisition unit configured to acquire, for each of frames, captured images corresponding to results of a plurality of exposures in the frame obtained by a sensor part including a plurality of pixels arranged in an array; and a generation unit configured to generate an output image on the basis of the captured image corresponding to a result of at least one of the plurality of exposures in the frame, wherein the generation unit, in a case where a camera shake correction function is enabled and an exposure time of at least one of the plurality of exposures is shorter than a threshold, generates a first output image by correcting a brightness of the captured image based on the at least one of the plurality of exposure.