SYSTEM AND METHOD FOR REMOTE ACCESSING

PROBLEM TO BE SOLVED: To provide a remote access system dispensing with resending of processing at a TCP layer or an application level, even when delay or disconnection occurs in a radio section. SOLUTION: A mobile terminal 4 converts transmission data from a TCP being the highest-order protocol to a WANP being the lowest-order protocol to send it to a WAN. An access server 1 receives data from the WAN, converts it from the WANP being the lowest-order protocol to the TCP being the highest- order protocol, and converts the TCP to Eternet (R) which is the lowest-order protocol to send it to a LAN. An application server 2 receives data from the LAN and converts it from Eternet being the lowest-order protocol to the TCP being the highest order protocol. An MUDP layer processing part for processing MUDP performs replacing of a PPP header with an MUDP header, adding of a SEQ number, checking and retransmission processing of a SEQ number.