Method for restricting communicating service in roaming in multi mode terminal and apparatus therefor

1. A method for performing roaming in a dual mode terminal, which includes a first wireless communication module corresponding to a first communication network and a second wireless communication module corresponding to a second communication network, the method comprising:

acquiring a public land mobile network (PLMN) identifier by camping on the first communication network;

determining whether connection to the first communication network is roaming by comparing roaming decision information included in the PLMN identifier with roaming decision information stored in the dual mode terminal;

turning off the second wireless communication module if it is determined that connection to the first communication network is roaming; and

transmitting and receiving a signal to and from the first communication network.

2. The method of claim 1 , wherein the roaming decision information is a mobile country code (MCC).

3. The method of claim 1 , wherein the roaming decision information is combination of a mobile country code (MCC) and a mobile network code (MNC).

4. The method of claim 1 , wherein the first communication network is a universal mobile telecommunications system (UMTS) communication network, and the second communication network is a long term evolution (LTE) communication network.

5. The method of claim 1 , further comprising:

determining whether the second wireless communication module is being operated if connection to the first communication network is not roaming; and

resuming the operation of the second wireless communication module if the second wireless communication module is not being operated.

6. The method of claim 1 , wherein a system providing a roaming service to the dual mode terminal includes the first communication network only.

7. A dual mode terminal in a wireless communication system, the dual mode terminal comprising:

a first wireless communication module for transmitting and receiving a signal to and from a first communication network;

a second wireless communication module for transmitting and receiving a signal to and from a second communication network;

a memory module storing roaming decision information; and

a processor processing the signal received from the first communication network and the signal received from the second communication network,

wherein the processor acquires a public land mobile network (PLMN) identifier by camping on the first communication network, determines whether connection to the first communication network is roaming by comparing roaming decision information included in the PLMN identifier with roaming decision information stored in the dual mode terminal, and turning off the second wireless communication module if it is determined that connection to the first communication network is roaming.

8. The dual mode terminal of claim 7 , wherein the roaming decision information is a mobile country code (MCC).

9. The dual mode terminal of claim 7 , wherein the roaming decision information is combination of a mobile country code (MCC) and a mobile network code (MNC).

10. The dual mode terminal of claim 7 , wherein the first communication network is a universal mobile telecommunications system (UMTS) communication network, and the second communication network is a long term evolution (LTE) communication network.

11. The dual mode terminal of claim 7 , wherein the processor determines whether the second wireless communication module is being operated if connection to the first communication network is not roaming, and resumes the operation of the second wireless communication module if the second wireless communication module is not being operated.

12. The dual mode terminal of claim 7 , wherein a system providing a roaming service to the dual mode terminal includes the first communication network only.