An apparatus, which forms a stereoscopic image by alternately displaying a left image and a right image, for reproducing a stereoscopic image in a pause mode, includes: a decoder unit configured to perform decoding on received image information; a 3D format generation unit configured to pair left and right images which are temporally consistent to generate stereoscopic image data; and a user input processing unit configured to receive a user selection with respect to image reproduction and delivering a corresponding signal to the decoder unit and the 3D format generation unit, wherein when the user input processing receives a to selection of a pause mode from the user, the decoder unit stops the decoding operation on the basis of the signal from the user input processing unit and the 3D format generation unit generates the stereoscopic image data by using the same left and right video frames. Even when a pause mode is selected while a stereoscopic image is being reproduced, the stereoscopic image can be outputted, and in this case, the stereoscopic image can be outputted in the pause mode without using any additional configuration.