PURPOSE: To enhance the data processing efficiency at data reception by high level data link control(HDLC).

CONSTITUTION: When a reception station 100 detects a transmission sequence number error in an information frame, the information frame sent after the information frame in which a transmission order number error is detected is stored in an information frame buffer 102 and re-transmission of the information frame sent after the information frame in which a transmission order number error is detected is requested to a transmission station 104. After the reception of the information frame from which the transmission order number error is detected, the information frame to be received succeedingly is extracted from the information frame buffer 102 and sent to a processing section 103.