A recorded data processing method is performed that includes generating synchronization information indicating a relationship of recorded data with respect to reference data on a time axis by comparing the recorded data including video recorded by a recording device and the reference data that act as a reference for the recorded data on a time axis and that represent audio or video; and transmitting from a terminal source material data that include video that corresponds to the recorded data and the synchronization information that was generated to an editing device that generates content including a plurality of mutually synchronized videos from a plurality of the source material data.