Rendering augmented reality image including virtual object with surface showing reflection of environment

In accordance with an aspect of the present disclosure, there is provided a method for processing image performed by image processing device for rendering an augmented reality image. The method comprises, acquiring a first real image corresponding to a first direction from the image processing device, acquiring a second real image corresponding to a second direction, different from the first direction, from the image processing device, determining reflectivity of a surface of a virtual object in the augmented reality image; and rendering, according to the reflectivity, the surface of the virtual object by using an environment texture, the environment texture generated based on the first real image and the second real image.