1. An image capture method comprising: performing light metering with respect to a subject in response to a first control signal; setting an ISO value and a shutter speed value based on result of the light metering; increasing the ISO value by a first amount and decreasing the shutter speed value by a second amount in response to a second control signal to capture a plurality of images, wherein the second amount is greater than the first amount; performing gamma correction on the plurality of images to increase brightness of each image; and synthesizing the plurality of gamma corrected images to obtain a single image with improved brightness.