1. A color balancing apparatus for multiple image synthesis, the color balancing apparatus comprising: an automatic white balance unit, with respect to each of a plurality of input images that are obtained by sequentially capturing adjacent scenes, configured to compare a neutral color representing the input image with chromaticity of standard sources that are predefined, determine a standard source which is closest to the neutral color among the standard sources as a standard illuminant, and perform a white balance on the input image based on the standard illuminant; and a wide-area image synthesis unit configured to generate a single wide-area image by synthesizing the plurality of input images subjected to the white balance based on the standard illuminant.