System, method and identification card for accessing operator networks

An embodiment of the invention provides a system, method and an identification card for accessing operator networks. The method includes: a terminal performs network searching, acquires the identification information of the currently-searched operator networks, and transmits the identification information to the identification card; the identification card judges whether the currently-searched operator networks contain the operator networks supported by the identification card or not according to the identification information stored by the identification card; if so, the identification card determines one of the operator networks supported by the identification card as the to-be-accessed operator network; the terminal accesses the to-be-access operator network through the identification card. By the method, even the location of the terminal changes and the original operator network signals do not exist anymore, the identification card needs not to be changed, and the terminal can access to the other operator networks supported by the identification card.