A method of operating an electronic device comprising a camera and a display, the method comprising: in response to a user input command, driving a camera to obtain an image, temporarily buffering the obtained image, and executing a preview mode for displaying the obtained image in a preview screen on the display; wherein, if the preview mode is identified to be executing in a multi-preview mode: processing the obtained image according to a plurality of preset image compositions to simultaneously display a plurality of preview images corresponding to the plurality of preset image compositions, wherein each preset image composition of the plurality of preset image compositions comprises the respective preview image being displayed in a respective aspect ratio of a plurality of different aspect ratios; if an input for selecting a preview image from the plurality of preview images is received, identifying a selected photographing mode; if the photographing mode is identified as comprising a multi-photographing mode, receiving a sequential selection of a plurality of the displayed preview images; performing multi-photographing operation to obtain multiple images corresponding to the aspect ratios of the selection of displayed images; storing the sequence of obtained multiple images; if the photographing mode is identified as comprising a full preview switching mode, displaying a full preview area including a single image of the selected preview image by switching to a full preview according to an aspect ratio of the selected preview image and displaying a mini preview area including remaining preview images not including the selected preview image from among the plurality of preview images; and if a photographing command is input by a user while displaying the selected preview image in the full preview switching mode, photographing according to the aspect ratio of the selected preview image. in response to a user input command, driving a camera to obtain an image, temporarily buffering the obtained image, and executing a preview mode for displaying the obtained image in a preview screen on the display; wherein, if the preview mode is identified to be executing in a multi-preview mode: processing the obtained image according to a plurality of preset image compositions to simultaneously display a plurality of preview images corresponding to the plurality of preset image compositions, wherein each preset image composition of the plurality of preset image compositions comprises the respective preview image being displayed in a respective aspect ratio of a plurality of different aspect ratios; if an input for selecting a preview image from the plurality of preview images is received, identifying a selected photographing mode; if the photographing mode is identified as comprising a multi-photographing mode, receiving a sequential selection of a plurality of the displayed preview images; performing multi-photographing operation to obtain multiple images corresponding to the aspect ratios of the selection of displayed images; storing the sequence of obtained multiple images; if the photographing mode is identified as comprising a full preview switching mode, displaying a full preview area including a single image of the selected preview image by switching to a full preview according to an aspect ratio of the selected preview image and displaying a mini preview area including remaining preview images not including the selected preview image from among the plurality of preview images; and if a photographing command is input by a user while displaying the selected preview image in the full preview switching mode, photographing according to the aspect ratio of the selected preview image. processing the obtained image according to a plurality of preset image compositions to simultaneously display a plurality of preview images corresponding to the plurality of preset image compositions, wherein each preset image composition of the plurality of preset image compositions comprises the respective preview image being displayed in a respective aspect ratio of a plurality of different aspect ratios; if an input for selecting a preview image from the plurality of preview images is received, identifying a selected photographing mode; if the photographing mode is identified as comprising a multi-photographing mode, receiving a sequential selection of a plurality of the displayed preview images; performing multi-photographing operation to obtain multiple images corresponding to the aspect ratios of the selection of displayed images; storing the sequence of obtained multiple images; if the photographing mode is identified as comprising a full preview switching mode, displaying a full preview area including a single image of the selected preview image by switching to a full preview according to an aspect ratio of the selected preview image and displaying a mini preview area including remaining preview images not including the selected preview image from among the plurality of preview images; and if a photographing command is input by a user while displaying the selected preview image in the full preview switching mode, photographing according to the aspect ratio of the selected preview image.