A multimedia service providing method according to an embodiment of the present invention may comprise: transmitting video data to a display device; transmitting a request message for requesting connection state information to one or more remote wireless speakers; receiving the connection state information from the one or more remote wireless speakers; separately calculating a delay time, which is a time at which a transmission delay is predicted, on the basis of the received connection state information; transmitting no audio data to a remote wireless speaker having a delay time longer than a preconfigured time from among the one or more remote wireless speakers; and transmitting the audio data to a remote wireless speaker having a delay time shorter than the preconfigured time from among the one or more remote wireless speakers, wherein the preconfigured time is configured to be a maximum allowable synchronization time difference between the video data and the audio data.