A method for restoring still image data acquired by capturing a subject image with an imaging element, includes: acquiring blur information regarding blur in a Y direction of the imaging element upon image capturing; sets a recovery matrix for recovering, from the still image data, image data to be acquired upon capturing the subject image in a state where there is no blur; recovers the image data by multiplying the recovery matrix and the still image data; computes plural types of noises which derive from the recovery matrix and which are periodically superimposed on the recovered image data in the Y direction, based on (i) noise period information regarding a noise superimposition period of each noise, (ii) the recovered image data, and (iii) the still image data; and eliminates the computed noise from the recovered image data.