An electronic device for generating stereo sound synchronized with a stereoscopic moving picture using a plurality of speakers (210, 220, 230, 240, 250, 260), the electronic device comprising: a receiver configured to receive a stereoscopic moving image including a plurality of frames; a controller configured to: obtain depth maps for previous and current frames, divide each of the depth maps for the previous and current frames into a plurality of regions corresponding to positions of the plurality of speakers (210, 220, 230, 240, 250, 260), generate a first histogram of each of the plurality of regions of the depth map corresponding to the previous frame, and a second histogram of each of the plurality of regions of the depth map corresponding to the current frame, obtain a change in depth information for each of the plurality of regions based on the first and second histograms of each of the plurality of regions, and produce, based on the change in depth information for each of the plurality of regions, a plurality of sound zooming factors, the sound zooming factors being parameters for controlling a magnitude of sound output through a stereo system, the sound zooming factors applying to the plurality of speakers (210, 220, 230, 240, 250, 260) the electronic device further comprising an audio processor configured to apply the plurality of sound zooming factors to sound signals corresponding to the plurality of speakers (210, 220, 230, 240, 250, 260) outputting sound signals for the stereoscopic moving image. a receiver configured to receive a stereoscopic moving image including a plurality of frames; a controller configured to: obtain depth maps for previous and current frames, divide each of the depth maps for the previous and current frames into a plurality of regions corresponding to positions of the plurality of speakers (210, 220, 230, 240, 250, 260), generate a first histogram of each of the plurality of regions of the depth map corresponding to the previous frame, and a second histogram of each of the plurality of regions of the depth map corresponding to the current frame, obtain a change in depth information for each of the plurality of regions based on the first and second histograms of each of the plurality of regions, and produce, based on the change in depth information for each of the plurality of regions, a plurality of sound zooming factors, the sound zooming factors being parameters for controlling a magnitude of sound output through a stereo system, the sound zooming factors applying to the plurality of speakers (210, 220, 230, 240, 250, 260) the electronic device further comprising an audio processor configured to apply the plurality of sound zooming factors to sound signals corresponding to the plurality of speakers (210, 220, 230, 240, 250, 260) outputting sound signals for the stereoscopic moving image. obtain depth maps for previous and current frames, divide each of the depth maps for the previous and current frames into a plurality of regions corresponding to positions of the plurality of speakers (210, 220, 230, 240, 250, 260), generate a first histogram of each of the plurality of regions of the depth map corresponding to the previous frame, and a second histogram of each of the plurality of regions of the depth map corresponding to the current frame, obtain a change in depth information for each of the plurality of regions based on the first and second histograms of each of the plurality of regions, and produce, based on the change in depth information for each of the plurality of regions, a plurality of sound zooming factors, the sound zooming factors being parameters for controlling a magnitude of sound output through a stereo system, the sound zooming factors applying to the plurality of speakers (210, 220, 230, 240, 250, 260) the electronic device further comprising an audio processor configured to apply the plurality of sound zooming factors to sound signals corresponding to the plurality of speakers (210, 220, 230, 240, 250, 260) outputting sound signals for the stereoscopic moving image.