1. A method for generating a photograph image in an electronic device, the method comprising: displaying a first preview image and a second preview image in a multi-preview mode, wherein the first preview image is obtained from a first image sensor and is displayed in a first preview area and the second preview image is obtained from a second image sensor is displayed in a second preview area; upon detection of a predetermined first user input in the second preview image while displaying the first preview image and the second preview image in the multi-preview mode, generating a photograph image by using the second preview image; and upon detection of a predetermined second user input in the first preview area or the second preview area in the multi preview mode, switching the multi-preview mode to a single-preview mode.