An apparatus comprises: a sensor; a controller that controls the sensor so as to obtain images by repeatedly capturing an image of a subject, and to output a detection signal for detecting flicker during a period since capturing of an Nth image is performed to capturing of an N+1th image is performed; a calculation unit that calculates information relating to flicker based on the detection signal; a selector that selects Nth information calculated based on the detection signal or N−1th information calculated immediately before the Nth information according to a predetermined condition relating to a period required for performing calculation based on the detection signal; and a determination unit that determines a capturing timing of the N+1th image based on the Nth information or the selected N−1th information.