A method of synchronizing data and an electronic device and system for implementing the same are provided. The head mounted device includes: a housing including a surface; a connection device connected to the housing to detachably connect the housing to a portion of a user head; a display exposed through a portion of the surface; a motion sensor located at the housing or connected to the housing configured to provide a first signal representing a movement of the housing; a communication circuit; a processor electrically connected to the display and the wire communication circuit; and a memory electrically connected to the processor and configured to store instructions, wherein the processor is configured to execute the instructions to receive the first signal from the motion sensor, to transmit first information based on the first signal using the communication circuit, to transmit second information including a time related to the first signal using the communication circuit, to receive multimedia data and third information related to the multimedia data corresponding to a time using the communication circuit, to discard a portion of the multimedia data based on the second information and the third information, and to display an image on the display using the multimedia data whose portion is discarded and to output audio using an audio output module.