An apparatus and a method for allocating a multiple resource unit (RU) for a user in a wireless local area network (WLAN) system are provided. A transmission device of the WLAN system includes a transceiver that generates a physical layer convergence protocol (PLCP) protocol data unit (PPDU) including a preamble and a payload and transmitting the generated PPDU to at least one receiving device and a processor controlling the transceiver. The preamble includes a plurality of training fields and a plurality of signaling fields. Resource unit (RU) allocation information on the at least one receiving device is included in one of the plurality of signaling fields. The RU allocation information includes a first subfield indicating an arrangement of RUs in a frequency domain corresponding to the PPDU and a second subfield indicating a portion of the RUs to be combined to form a multiple RU.