An image processing apparatus comprises a processing unit which executes determination processing for determining a parameter to be used in development processing of a target playback frame within a RAW movie file, based on a difference between a parameter for the target playback frame and a parameter used in development processing of a proceeding frame, a developing unit which performs development processing on a RAW image of the target playback frame using the determined parameter, and a control unit which, when a playback start position is designated by a user, determines a parameter for a frame of interest corresponding to the playback start position, by causing the processing unit to execute the determination processing for each of a plurality of frames from a frame that is a preset number of frames before the frame of interest to the frame of interest.