1. A method of recognizing an object by a camera, the method comprising: capturing a first preview image; detecting feature information from the first preview image; comparing the feature information with a threshold condition; when the feature information does not satisfy the threshold condition, selecting a camera setting parameter from a plurality of camera setting parameters based on a preset selection order of the plurality of camera setting parameters, changing the selected camera setting parameter, capturing a next preview image in accordance with the changed camera setting parameter, detecting next feature information from the next preview image generated based on the changed camera setting parameter, comparing the next feature information with the threshold condition, performing object recognition for the next preview image when the next feature information satisfies the threshold condition, and repeating the selecting, changing, capturing, detecting, and comparing steps, when the next feature information does not satisfy the threshold condition, wherein, when the selected camera setting parameter relates to zoom control, changing the selected camera setting parameter comprises: selecting a region of interest from an image frame; and cropping the region of interest in the image frame, wherein the object recognition is performed for the cropped region of interest.