A method for transmitting a frame to a plurality of stations, STAs, by an Access Point, AP, in a Wireless Local Area Network, WLAN, system, the method comprising: generating, at the AP, a radio frame including a plurality of signaling, SIG, fields including a SIG A field, a SIG B field, and a data field; and transmitting the radio frame to the plurality of STAs, wherein the SIG B field includes a common field and a user specific field following the common field, the common field including resource allocation information, and the user specific field including user specific control information, wherein the common field and the user specific field of the SIG B field are encoded into a plurality of SIG B channels, each SIG B channel includes a plurality of SIG B encoding blocks per 20 MHz band, wherein the plurality of SIG B channels includes a first SIG B channel transmitted in a first 20 MHz band and a second SIG B channel transmitted in a second 20 MHz band, wherein: the SIG B field is separately encoded on each 20 MHz band, in each 20 MHz band, the common field is encoded into one Binary Convolutional Coding, BCC, block, and the user specific field is encoded into a plurality of BCC blocks, each BCC block except for a last BCC block among the plurality of BCC blocks is related to 'K' STAs, where 'K' is a natural number equal to or larger than 2, the first SIG B channel includes resource allocation information for one or more first-band STAs to which resources are allocated in the first 20 MHz band and resource allocation information for one or more second-band STAs to which resources are allocated in the second 20 MHz band, and a length of each of the plurality of the SIG B channels including the first SIG B channel and the second SIG B channel is set to be the same for every 20 MHz band. generating, at the AP, a radio frame including a plurality of signaling, SIG, fields including a SIG A field, a SIG B field, and a data field; and transmitting the radio frame to the plurality of STAs, wherein the SIG B field includes a common field and a user specific field following the common field, the common field including resource allocation information, and the user specific field including user specific control information, wherein the common field and the user specific field of the SIG B field are encoded into a plurality of SIG B channels, each SIG B channel includes a plurality of SIG B encoding blocks per 20 MHz band, wherein the plurality of SIG B channels includes a first SIG B channel transmitted in a first 20 MHz band and a second SIG B channel transmitted in a second 20 MHz band, wherein: the SIG B field is separately encoded on each 20 MHz band, in each 20 MHz band, the common field is encoded into one Binary Convolutional Coding, BCC, block, and the user specific field is encoded into a plurality of BCC blocks, each BCC block except for a last BCC block among the plurality of BCC blocks is related to 'K' STAs, where 'K' is a natural number equal to or larger than 2, the first SIG B channel includes resource allocation information for one or more first-band STAs to which resources are allocated in the first 20 MHz band and resource allocation information for one or more second-band STAs to which resources are allocated in the second 20 MHz band, and a length of each of the plurality of the SIG B channels including the first SIG B channel and the second SIG B channel is set to be the same for every 20 MHz band. the SIG B field is separately encoded on each 20 MHz band, in each 20 MHz band, the common field is encoded into one Binary Convolutional Coding, BCC, block, and the user specific field is encoded into a plurality of BCC blocks, each BCC block except for a last BCC block among the plurality of BCC blocks is related to 'K' STAs, where 'K' is a natural number equal to or larger than 2, the first SIG B channel includes resource allocation information for one or more first-band STAs to which resources are allocated in the first 20 MHz band and resource allocation information for one or more second-band STAs to which resources are allocated in the second 20 MHz band, and a length of each of the plurality of the SIG B channels including the first SIG B channel and the second SIG B channel is set to be the same for every 20 MHz band.