A method for enhancing a concurrent processing capability of a wireless local area network, WLAN, comprising: receiving, by an access point, AP, a first association request sent by a first station, STA, wherein the first association request comprises an identifier of the first STA, and the first association request is used to indicate that the first STA requests association with the AP; performing, by the AP, association with the first STA, wherein the AP first performs association with the first STA before obtaining a decision on whether a WLAN controller allows the first STA to be associated with the AP or not; sending, by the AP, a first association query request to a WLAN controller, wherein the first association query request comprises the identifier of the first STA, and the first association query request is used to query whether the WLAN controller allows the first STA to be associated with the AP; receiving, by the AP after the AP performs association with the first STA, an association query response returned by the WLAN controller, wherein the association query response is a response message for the first association query request; and performing, by the AP, disassociation from the first STA if the association query response is used to instruct the AP not to perform association with the first STA, wherein after sending a second association query request and before sending the first association query request, the AP receives a second association request sent by a second STA, wherein the second association request comprises an identifier of the second STA, the second STA is a STA different from the first STA, and the second association query request is an association query request prior to the first association query request sent by the AP; and the sending, by the AP, a first association query request to a WLAN controller comprises: after determining that a first sending condition is met, sending, by the AP to the WLAN controller, the first association query request carrying the identifier of the first STA and the identifier of the second STA, wherein the first sending condition comprises at least one of the following: A quantity of association requests received by the AP after the AP sends the second association query request reaches a first quantity threshold, or duration after the second association query request is sent reaches a first duration threshold. receiving, by an access point, AP, a first association request sent by a first station, STA, wherein the first association request comprises an identifier of the first STA, and the first association request is used to indicate that the first STA requests association with the AP; performing, by the AP, association with the first STA, wherein the AP first performs association with the first STA before obtaining a decision on whether a WLAN controller allows the first STA to be associated with the AP or not; sending, by the AP, a first association query request to a WLAN controller, wherein the first association query request comprises the identifier of the first STA, and the first association query request is used to query whether the WLAN controller allows the first STA to be associated with the AP; receiving, by the AP after the AP performs association with the first STA, an association query response returned by the WLAN controller, wherein the association query response is a response message for the first association query request; and performing, by the AP, disassociation from the first STA if the association query response is used to instruct the AP not to perform association with the first STA, wherein after sending a second association query request and before sending the first association query request, the AP receives a second association request sent by a second STA, wherein the second association request comprises an identifier of the second STA, the second STA is a STA different from the first STA, and the second association query request is an association query request prior to the first association query request sent by the AP; and the sending, by the AP, a first association query request to a WLAN controller comprises: after determining that a first sending condition is met, sending, by the AP to the WLAN controller, the first association query request carrying the identifier of the first STA and the identifier of the second STA, wherein the first sending condition comprises at least one of the following: A quantity of association requests received by the AP after the AP sends the second association query request reaches a first quantity threshold, or duration after the second association query request is sent reaches a first duration threshold.