1. An image processing apparatus comprising: an obtaining unit configured to obtain an image signal that is capable of generating a plurality of reconstruction images, wherein each subject included in the image having different subject distances is capable of being focused in each reconstruction image; a generating unit configured to generate a first reconstruction image from the image signal obtained by the obtaining unit; a display control unit configured to cause a displaying medium to display the first reconstruction image; a receiving unit configured to receive an instruction for performing enlarged display or reduced display of the first reconstruction image displayed on the displaying medium; and a control unit configured to control, when an instruction for performing enlarged display or reduced display of the reconstruction image displayed on the displaying medium is received, whether the control unit causes the display control unit to perform enlarged display or reduced display of an image corresponding to the first reconstruction image displayed on the displaying medium, or whether the control unit causes the generating unit to generate a second reconstruction image in which a subject distance that is different from a subject distance in the first reconstruction image displayed on the display control medium is focused and causes the displaying unit to perform enlarged display or reduced display of the generated second reconstruction image on the displaying medium.