1. A method of determining an image compression format, the method comprising: encoding a high-quality image with respect to a 3-dimensional (3D) stereo image constituted by the high-quality image and a low-quality image; determining an image compression format in which a resolution of the encoded low-quality image is higher than or equal to a reference value in comparison to the high-quality image; encoding the low-quality image according to the determined image compression format; transmitting the encoded high-quality image through a first channel; and transmitting the encoded low-quality image through a second channel.