Method of translating protecol at translator, method of providing protocol translation information at translation server, and address translation server

A method of translating protocols at a translator connected to a first network for transferring data in a first protocol, to a second network for transferring data in a second protocol, and to a translation server to which other translators are connected, said translator retaining translation information for a protocol translation between said first protocol and said second protocol, the method comprising the steps of:

• detecting an address query of a terminal accommodated in said second network, from a first mobile terminal accommodated in said first network;
• generating a second address in said first protocol corresponding to a first address in said second protocol provided to said terminal;
• retaining a correspondence between said first address and said second address as said translation information;
• and
• registering the correspondence between said first address and said second address at said translation server.