Disclosed are a method and device for determining a baseband parameter, used for solving the problem of there not yet being an explicit solution for how to determine a numerology in a new radio communication system. The method comprises: according to an initial synchronization signal it detects, a terminal determining the TRP group to which said terminal belongs; according to a third synchronization signal detected in the TRP group and/or system information of the terminal group, the terminal determining the numerology. The solution provided by the embodiments of the present invention correctly identifies numerologies corresponding to different sub-bands, different TRPs, and/or different beams in a TRP group, thus achieving synchronization with different sub-bands, different TRPs, and/or different beams in the TRP group and ensuring that the terminal may operate, according to correct numerology, on a corresponding sub-band, TRP, or beam.