The present specification relates to a method for transceiving a signal by a station in a wireless LAN (WLAN) system and, more particularly, provides a method for transmitting or receiving a signal on the basis of a header field, which is differently configured depending on whether a Physical Protocol Data Unit (PPDU) format transmitted by a station is a multiuser-multiple input multiple output (MU-MIMO) format or a frequency division multiple access (FDMA) format, and a device therefor.