An image capture device and a method of calibrating automatic white balance thereof are provided. The method includes generating first and second frame data using first and second image sensors, respectively, in response to incident light; generating first and second color temperature estimation information based on the first frame data and the second frame data, respectively; determining whether an amount of the first color temperature estimation information is sufficient to estimate a color temperature of a light source; estimating the color temperature of the light source based on the first color temperature estimation information when the amount of the first color temperature estimation information is sufficient; and when the amount of the first color temperature estimation information is insufficient estimating the color temperature of the light source based on the first and second color temperature estimation information; and adjusting the first frame data based on the estimated color temperature.