A multimedia device and controlling method thereof are disclosed, by which heterogeneous devices are controlled under at least two different communication protocols. The present invention includes displaying a guide message for controlling at least one function of the electronic device, receiving a remote control signal corresponding to a 1st function among the at least one function from a 1st remote controller of the electronic device, saving data for identifying the 1st function and the received remote control signal in a memory by mapping the data and the received remote control signal to each other, displaying a graphic image including the data for identifying the 1st function, if the data for identifying the 1st function is selected by a 2nd remote controller of the multimedia device, extracting the remote control signal mapped to the 1st function, and transmitting the extracted remote control signal to an external device.