PROBLEM TO BE SOLVED: To provide a method and a device for selecting a synchronization source in device to device (D2D) communication.;SOLUTION: A device 800 comprises a synchronization source reception unit 840 for receiving prescribed wireless sync signals from multiple synchronization sources 810-830, a metric acquisition unit 850 for finding selection metrics of respective synchronization sources on the basis of at least two, out of the quality of received sync signal, whether the synchronization source routes the sync signal from a network node or independently therefrom, and the number of hops until the network node, a synchronization source selection unit 860 for selecting a synchronization source according to a metric found by the metric acquisition unit, and a timing unit 870 for determining or adjusting the transmission or reception timing of data, according to the sync signal of the synchronization source selected by the synchronization source selection unit.;SELECTED DRAWING: Figure 8;COPYRIGHT: (C)2019,JPO&INPIT
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