A method for indicating a channel resource, comprising: receiving, on a first channel by an access point, a request message sent by a station, wherein the request message comprises indication information used for indicating that the station is a supporting type station, the supporting type station is a station supporting channel information indicated by the access point, and the first channel is a minimum channel unit; and sending, by the access point, a confirmation message to the station according to the request message, wherein the confirmation message comprises channel information used for communication between the access point and the station, and the channel information comprises at least the first channel; wherein the channel information comprises a channel bitmap and an association identifier that is allocated by the access point to the station, and the channel bitmap indicates, according to bits, at least one channel used by the station to send data, characterised in that: the request message is a request to send message, and the confirmation message is a clear to send message; or the request message is a block acknowledgement request message, and the confirmation message is a block acknowledgement confirmation message; in that an original receiving address, RA, field of six bytes in the confirmation message is divided into two parts: an association identifier, AID, field of two bytes and a channel bitmap field of four bytes, or the original RA field of six bytes in the confirmation message is divided into three parts: an AID field of two bytes, an offset field of two bytes, and a channel bitmap field of two bytes; and wherein that the confirmation message comprises the channel information used for communication between the access point and the station is specifically: storing the association identifier in the AID field in the confirmation message, and storing the channel bitmap in the channel bitmap field in the confirmation message. receiving, on a first channel by an access point, a request message sent by a station, wherein the request message comprises indication information used for indicating that the station is a supporting type station, the supporting type station is a station supporting channel information indicated by the access point, and the first channel is a minimum channel unit; and sending, by the access point, a confirmation message to the station according to the request message, wherein the confirmation message comprises channel information used for communication between the access point and the station, and the channel information comprises at least the first channel; wherein the channel information comprises a channel bitmap and an association identifier that is allocated by the access point to the station, and the channel bitmap indicates, according to bits, at least one channel used by the station to send data, characterised in that: the request message is a request to send message, and the confirmation message is a clear to send message; or the request message is a block acknowledgement request message, and the confirmation message is a block acknowledgement confirmation message; in that an original receiving address, RA, field of six bytes in the confirmation message is divided into two parts: an association identifier, AID, field of two bytes and a channel bitmap field of four bytes, or the original RA field of six bytes in the confirmation message is divided into three parts: an AID field of two bytes, an offset field of two bytes, and a channel bitmap field of two bytes; and the request message is a request to send message, and the confirmation message is a clear to send message; or the request message is a block acknowledgement request message, and the confirmation message is a block acknowledgement confirmation message; in that an original receiving address, RA, field of six bytes in the confirmation message is divided into two parts: an association identifier, AID, field of two bytes and a channel bitmap field of four bytes, or the original RA field of six bytes in the confirmation message is divided into three parts: an AID field of two bytes, an offset field of two bytes, and a channel bitmap field of two bytes; and wherein that the confirmation message comprises the channel information used for communication between the access point and the station is specifically: storing the association identifier in the AID field in the confirmation message, and storing the channel bitmap in the channel bitmap field in the confirmation message.