PURPOSE: To parallelly switch plural data whose storage positions of the identification information of a transmission destinations are different from each other and to improve the exchange efficiency of lines by selecting the line of an identification number retrieved based on the position data of the frame and a required identifier and transmitting reception data.

CONSTITUTION: When the data frame of a LAN line 152 is received, an NT 301 transfers a TYPE to an AP 102, selects a channel and sends out communication destination identification information through a DMAC 103. The AP 102 fetches it and generates interruption to a CPU 12h when it is registered and the CPU 121 reads a segment address from the address register of the AP 102, adds '1', writes it in the address register and specifies the port address of the data. Then, connection to an output port read from a memory register is set in an SEU 111, data transfer from the AP 102 to the SEU 111 is set in the DMAC 103 and the write of the data is performed to the SEU 111.