User terminal device and method for providing interaction service therefor

A method for providing an interaction service of a user terminal device is disclosed. The method for providing an interaction service comprises the steps of: executing a video call service with a counterpart device; searching for a peripheral device to be used as a data input source with respect to the video call service; receiving video call data from at least one peripheral device among the detected peripheral devices; and transmitting the received video call data to the counterpart device.