Router

A router for controlling transmission of packets over a plurality of networks, the router having a function of carrying out address translation of addresses added to said packets between private addresses and global addresses, the router comprising:

• a plurality of interfaces each connected to a corresponding one of said plurality of networks;
• a first storage device that stores data for said address translation, said data being set by a user;
• a second storage device that stores information for applying said data stored in said first storage device to each of said plurality of interfaces, said information being set by said user;
• a control device that prepares translation management information for each of said plurality of interfaces, based on said data stored in said first storage device and said information stored in said second storage device;
• and
• a translation device arranged in each of said plurality of interfaces, for carrying out said address translation of one of said addresses added to each packet of said packets, based on said translation management information.