Network system that can easily remotely access other networks

摘要

A network system that can easily carry out remote access of a different network. The network system comprises a first image processing apparatus connected to a first network and a second image processing apparatus connected to a second network having a network address different from that of the first network. The first image processing apparatus includes a first network interface connected to the first network; a second network interface that can build a third network, that is different from the first and second networks, between it and a terminal that is normally connected to the second network and in which the first IP address in the second network is set; an IP header editing unit that performs processing such that the address of the IP packets sent from the terminal via the third network is the IP address of the second image processing apparatus; and a packet transmission unit that sends the IP packets processed by the IP header editing unit to a network via the first network interface, and the second image processing apparatus includes a response header editing unit that performs processing to make the first network interface the destination for responses to IP packets sent by the terminal via the first image processing apparatus.