Stylus pen, terminal device set and controlling method thereof

A terminal device set comprising:

• a stylus pen housed in and withdrawn from a main terminal device, configured to receive a contact command of a user and transmit the received voice command to the main terminal device;
• and
• a main terminal device configured to perform an operation corresponding to the received voice command,
• wherein the stylus pen is further configured to:
• based on being withdrawn from the main terminal device and receiving a first contact command from the user, activate a microphone in a deactivated state to convert to a main voice input device, and based on receiving a second contact command, transmit application execution control data for executing an application of the main terminal device to the main terminal device, and wherein the main terminal device is further configured to:
• execute an application corresponding to the received application execution control data, and
• output a command set used in the executed application.