Abstract: Disclosed are a system and a method for providing an avatar service with the background having the reality. A 3-D avatar service is provided under a 2-D background image and a user feels as if the 2-D background image is realized as a 3-D space. Thus, the user feels the reality as if the avatar exists in the 3-D space based on the 2-D images photographed by a camera without performing the 3-D rendering.