Patent ID: 8391917

Claim:
A system access method of a multi-mode multi-standby terminal that can access at least two radio communication systems comprising: receiving, in a state where the multi-mode multi standby terminal is set to a preset system preference mode, a system access request signal corresponding to a request for initiating a call; detecting, upon receiving the system access request signal, the preset system preference mode; attempting to access a radio communication system according to the detected system preference mode; determining whether the multi-mode multi-standby terminal fails to access the radio communication system after a preset number of attempts; and outputting, if the multi-mode multi-standby terminal fails to access the radio communication system after the preset number of attempts, a guide message for guiding a subsequent input of the user, wherein attempting to access the radio communication system comprises: determining whether the preset system preference mode is a normal mode; outputting, if the preset system preference mode is the normal mode, a system selection request message; receiving a system selection signal in response to the system selection request message; and attempting to access a selected system according to the system selection signal.