Wireless relay device and method of processing data using the same

A wireless relay device, comprising:

• a voice I/O unit configured to receive or output a user voice signal;
• a voice processing unit configured to perform voice processing on the user voice signal so that the user voice signal corresponds to a wireless channel;
• an information protection processing unit configured to encrypt or decrypt voice data, corresponding to results processed by the voice processing unit, using an information protection algorithm;
• a Wi-Fi unit configured to send the encrypted voice data to a member of a group of portable devices which communicate with each other within a short communication range through the wireless relay device, or to receive encrypted voice data from a member of a group of portable devices which communicate with each other within a short communication range through the wireless relay device;
• a radio transmission and reception unit configured to relay wireless communication to a member of another group of portable devices which communicate with each other within a short communication range through another wireless relay device;
• a subscriber management unit configured to store and manage a unique identification number of each of the portable devices which communicate with each other within a short communication range through the wireless relay device;
• and
• a control unit configured to compare a unique identification number of a recipient, corresponding to data input or output via the voice I/O unit, with a unique identification number stored in the subscriber management unit, and to determine whether to perform wireless relaying via the Wi-Fi unit or via the radio transmission and reception unit based on results of the comparison.