The present invention provides Fast Initial Link Setup communication device and method, wherein, the device comprises: a service processing module which generates a Beacon frame which physical frame header comprises a first identification information field and/or a physical layer convergence procedure service data unit comprises a second identification information field, and the value of the first identification information field is a first value and/or the value of the second identification information field is a second value, which shows that a Fast Initial Link Setup function is supported, and sends the Beacon frame; and/or receives an initial link setup first message; and a wireless transceiver module. The present invention solves the compatibility problem that an STA that does not support the FILS function enters a WLAN network which supports the FILS function and an STA that supports the FILS function enters a WLAN that does not support the FILS function.