1. A method for preventing unauthorized use of a mobile terminal, comprising: decrypting a Mobile Phone Certificate (MPC) using an MPC decryption execution code stored in an execution code processor by the execution code processor, when the mobile terminal is booted; comparing an MPC decryption execution code pre-stored in an MPC processor with the MPC decryption execution code stored in the execution code processor by the MPC processor; comparing an MPC encryption key pre-stored in the MPC processor with an MPC encryption key stored in the execution code processor by the MPC processor, when the MPC decryption execution codes are identical; setting data required for an initial operation of the mobile terminal using an MPC management execution code included in an MPC pre-stored in the MPC processor by the MPC processor, when the MPC encryption keys are identical; decrypting Secured Code (SCode) blocks required for execution of an application program by the MPC processor, after executing the MPC management execution code; and performing an operation program of the mobile terminal using the MPC management execution code and the decrypted SCode blocks by the execution code processor.