An identity protocol gate way according to the exemplary embodiments of the present invention includes an artifact generating and inquiring module generating an artifact by receiving a sharing request message from a mobile identity wallet according to a request made by an application program of a mobile device, inquiring corresponding identity information according to a request of the identity information including the artifact from a web server and transferring the inquired identity information to the web server; and a protocol converting module converting the sharing request message into a protocol message of a wired environment by receiving the sharing request message from the mobile identity wallet, transferring the protocol message to the identity web server, transferring sharing response information and the artifact to the application program of the mobile device by using a mobile protocol in response to the sharing response information from the identity web server.