In a packet data processing determination apparatus (DBA1) for respectively and sequentially determining a plurality of packet data (P) composing an inputted transport stream (TS), a packet data storage section (270) stores the packet data (P) for a predetermined time period in the order in which they came. A stored packet data identifying section (270, 260) reads identification information (PIDe) from the stored packet data (P). A target packet data determining section (400) compares the read identification information (PIDe) with predetermined process information (PIDd) to determine whether the packet data (P) is to be processed.