Packet data extractor, a control method of the packet data extraction device, a control program, a computer-readable recording medium

Packet data extraction device of the present invention (10), the procedure name confirmation unit for confirming the procedure name of the message contained in the payload of the target packet (P) and (12), pre-associated data position information in procedure name ( accordance 14b), comprises a data acquisition unit that acquires the target data from the payload object packets specified by the data location information and (13).