An operation method of a first UWB (ultra wide band) device according to an embodiment of the present disclosure may include the steps of: transmitting, through UWB channels, data from a data round in a data block to a plurality of UWB devices; receiving, through NB (narrow band) channels, first feedback information for the data from a second UWB device from among the plurality of UWB devices; and processing the data on the basis of the first feedback information.