1. A method of processing an image by an image processing apparatus, the method comprising: obtaining first image data including a face; obtaining voice data; determining whether the voice data satisfies a preset condition after the first image data is obtained; obtaining location information of a face part within the first image data when the voice data satisfies the preset condition; generating synthesized image data by adding second image data corresponding to the satisfied condition to the first image data at a location of the face part; and displaying the synthesized image data.