Patent ID: 8621219

Claim:
A terminal control method of a terminal management server in a communication system, comprising: receiving, from a first terminal, an authorization assignment request message for assigning, from the first terminal to a second terminal, control authorization for controlling a third terminal that executes a function in response to an external command; checking the second terminal in response to receipt of the authorization assignment request message; generating a one-time secret key as a result of the checking; transmitting the one-time secret key to the second terminal; receiving, from the second terminal, a remote control request message for controlling the third terminal with a second key; determining whether the second key received with the remote control request message is a valid according to the one-time secret key; and sending, when the second key is determined to be valid, the remote control request message to the third terminal, wherein sending the remote control request message comprises: transmitting, when the second key is determined to be invalid, a remote control confirm request message to the first terminal for confirming whether the first terminal attempts to assign the authorization for controlling the third terminal; regenerating, when a response message is received in response to the remote control confirm request message, the one-time secret key; and transmitting the regenerated one-time secret key to the second terminal.