An MMT apparatus and an MMT method for processing stereoscopic video data are disclosed. An MMT apparatus, according to an embodiment, comprises: an asset file generation unit for generating a singleasset file including all or a part of stereoscopic video data; and a signaling message generation unit for generating a signaling message for delivery or consumption of the stereoscopic video data. Inaddition, at least one from among the generated single asset file and the generated signaling message includes stereoscopic video information related to the stereoscopic video data.