In an image capturing apparatus, a generation unit performs image processing to generate a synchronizing signal for an image sensor, an image generation unit generates image data using an electric signal obtained from the image sensor, and a display control unit reads out the image data stored in a storage unit and displays it on a display unit. The generation unit controls a phase of the synchronizing signal such that the display processing starts when the image processing for a predetermined volume of image data is finished if a frame period (first period) of the image sensor is shorter than a frame period (second period) of the display control unit, and that a predetermined volume of unprocessed image data is left in the storage unit when the image processing for one frame is finished if the first period is not shorter than the second period.