Image processing apparatus having display device, control method therefor, and storage medium

An image processing apparatus capable of reducing storage capacity and lightening processing loads while keeping visual quality of shooting information high. An output unit resizes a taken image into images with resolutions corresponding to respective resolutions of a plurality of image output destinations including a display unit and output the images at the same time. A superimposition unit individually superimposes shooting information corresponding to the respective resolutions of the plurality of image output destinations on the images. A control unit provides control such that the shooting information is superimposed on the image output to the display unit and a selected image output destination and the output unit outputs the same, and that the output unit outputs the image to an image output destination that has not been selected without superimposing the shooting information on the image.