A method of a first device which performs ranging by using an ultra-wide band (UWB) and the first device are provided. The method of the first device includes performing ranging with a second device in a first ranging round among a plurality of ranging rounds included in a first ranging block, determining whether to perform hopping, based on a result of the performing of the ranging, when it is determined to perform the hopping, determining an index of a second ranging round for performing ranging with a second device, based on a random-number generation function, and performing the ranging with the second device in the second ranging round of a second ranging block.