Provided is an application stored in a computer-readable storage medium to perform a method of providing a video call service, the method including, in a first terminal, establishing a video call session between the first terminal and a second terminal; modulating and displaying an area of an image of a second user, except for an exposure area, the image of the second user being displayed in the first terminal; detecting a predetermined event during the video call session; and controlling a size of the exposure area based on the predetermined event.