The invention provides a decoder and an operating method thereof. The decoder comprises a preceding unit, a database, a data filter and a scheduling server; the preceding unit is used for providing packaging information for the data series flow; the database is used for recording a plurality of parameter groups; the scheduling server extracts corresponding parameter groups from the database according to the packaging information provided by the preceding unit and stores the extracted parameter groups in the data filter; and the data filter compares the data series flow according to the parameter groups stored in the data filter and outputs the comparison result.