An image capturing apparatus (100, 200) comprising: a first camera (110, 210) and a second camera (120, 220) having different optical characteristics and configured to capture images of a same subject; and a controller (130, 230) configured to: set a first region of interest, ROI, including the subject in a first image captured by the first camera, wherein a size of the first ROI is determined according to a size of the subject in the first image, determine a size of a second ROI based on the determined size of the first ROI and based on a difference between a first angle of view of a lens of the first camera and a second angle of view of a lens of the second camera, detect the second ROI, having the determined size and matching the first ROI, in a second image captured by the second camera, based on a difference in optical characteristics of the first camera and optical characteristics of the second camera, wherein a location of the second ROI is determined by: performing at least one of scaling the size of the second ROI to the size of the first ROI and scaling the size of the first ROI to the size of the second ROI; and comparing pixel values of the first ROI with pixel values of the second ROI while moving the second ROI of the determined size within the second image, detect a disparity between the first ROI and the second ROI, and adjust focuses of lenses included in the first camera and the second camera based on the detected disparity. a first camera (110, 210) and a second camera (120, 220) having different optical characteristics and configured to capture images of a same subject; and a controller (130, 230) configured to: set a first region of interest, ROI, including the subject in a first image captured by the first camera, wherein a size of the first ROI is determined according to a size of the subject in the first image, determine a size of a second ROI based on the determined size of the first ROI and based on a difference between a first angle of view of a lens of the first camera and a second angle of view of a lens of the second camera, detect the second ROI, having the determined size and matching the first ROI, in a second image captured by the second camera, based on a difference in optical characteristics of the first camera and optical characteristics of the second camera, wherein a location of the second ROI is determined by: performing at least one of scaling the size of the second ROI to the size of the first ROI and scaling the size of the first ROI to the size of the second ROI; and comparing pixel values of the first ROI with pixel values of the second ROI while moving the second ROI of the determined size within the second image, detect a disparity between the first ROI and the second ROI, and adjust focuses of lenses included in the first camera and the second camera based on the detected disparity. set a first region of interest, ROI, including the subject in a first image captured by the first camera, wherein a size of the first ROI is determined according to a size of the subject in the first image, determine a size of a second ROI based on the determined size of the first ROI and based on a difference between a first angle of view of a lens of the first camera and a second angle of view of a lens of the second camera, detect the second ROI, having the determined size and matching the first ROI, in a second image captured by the second camera, based on a difference in optical characteristics of the first camera and optical characteristics of the second camera, wherein a location of the second ROI is determined by: performing at least one of scaling the size of the second ROI to the size of the first ROI and scaling the size of the first ROI to the size of the second ROI; and comparing pixel values of the first ROI with pixel values of the second ROI while moving the second ROI of the determined size within the second image, detect a disparity between the first ROI and the second ROI, and adjust focuses of lenses included in the first camera and the second camera based on the detected disparity.