Receiving device, transmitting device, and data processing method

A receiving device is provided. The receiving devices includes circuitry that is configured to execute an application related to a program or a channel, The circuitry is configured to set, based on the application, broadcast reception data from a broadcast as a media source object corresponding to a processing object of media reproduction. The circuitry is configured to obtain, based on the application, broadcast content segment information of broadcast content in the broadcast reception data that is stored in a buffer associated with the media source object. The circuitry is configured to perform, based on the application and the broadcast content segment information of a segment of the broadcast content to be replaced being obtained, replacement or appendance of the broadcast content in the broadcast reception data stored in the buffer with network content in application reception data received via a network.