This technique relates to a transmission device, a transmission method, a reception device and a reception method that enable mosaic image frames to be easily obtained. Delivered are the meta data of content that are described by use of attributes and attribute values and that include both signaling information indicating that the video is a thumbnail video suitable for constituting mosaic image frames and an attribute representative of information to be used for referring to a file including information to be used for receiving the content provided by a service. This technique is applicable, for example, to a case of delivering content.