A physical layer convergence protocol protocol data unit (PPDU) sending method, comprising: generating, by a first access point, a first PPDU, wherein the first PPDU comprises a first physical layer preamble, the first physical layer preamble is the same as a second physical layer preamble, the second physical layer preamble is comprised in a second PPDU, the second PPDU is generated by a second AP, the first AP and the second AP are comprised in a same AP coordinated set, and the AP coordinated set serves a first station, wherein the first physical layer preamble comprises signaling information used to parse the first PPDU, the signaling information comprises a special basic service set color, and the special BSS color is used to indicate a special BSS established by the AP coordinated set; sending, by the first AP, the first PPDU, wherein a data part of the first PPDU comprises data of the first STA, the data part of the first PPDU is different from a data part of the second PPDU, wherein the signaling information comprises a signaling A (SIG-A) field and a signaling B (SIG-B) field, the SIG-A field comprises transmission parameters of the first PPDU and the second PPDU, the SIG-B field comprises resource allocation information that carries the data of the first STA, and the SIG-A field comprises the special BSS color; characterised in that: the SIG-B field further comprises an AP selection field, and the AP selection field is used to indicate, to the first station, a data source of the data part of the first PPDU; and before the sending, by the first AP, the first PPDU, the method further comprises: sending, by the first AP, a beacon frame, wherein the beacon frame comprises a flag bit of the special BSS and AP indication information, wherein the flag bit of the special BSS is used to indicate that the special BSS is used for coordinated transmission, and the AP indication information is used to indicate an AP in the AP coordinated set, wherein the SIG-A field further comprises indication information, and the indication information is used to indicate whether the first PPDU is a coordinately transmitted PPDU. generating, by a first access point, a first PPDU, wherein the first PPDU comprises a first physical layer preamble, the first physical layer preamble is the same as a second physical layer preamble, the second physical layer preamble is comprised in a second PPDU, the second PPDU is generated by a second AP, the first AP and the second AP are comprised in a same AP coordinated set, and the AP coordinated set serves a first station, wherein the first physical layer preamble comprises signaling information used to parse the first PPDU, the signaling information comprises a special basic service set color, and the special BSS color is used to indicate a special BSS established by the AP coordinated set; sending, by the first AP, the first PPDU, wherein a data part of the first PPDU comprises data of the first STA, the data part of the first PPDU is different from a data part of the second PPDU, wherein the signaling information comprises a signaling A (SIG-A) field and a signaling B (SIG-B) field, the SIG-A field comprises transmission parameters of the first PPDU and the second PPDU, the SIG-B field comprises resource allocation information that carries the data of the first STA, and the SIG-A field comprises the special BSS color; characterised in that: the SIG-B field further comprises an AP selection field, and the AP selection field is used to indicate, to the first station, a data source of the data part of the first PPDU; and before the sending, by the first AP, the first PPDU, the method further comprises: sending, by the first AP, a beacon frame, wherein the beacon frame comprises a flag bit of the special BSS and AP indication information, wherein the flag bit of the special BSS is used to indicate that the special BSS is used for coordinated transmission, and the AP indication information is used to indicate an AP in the AP coordinated set, wherein the SIG-A field further comprises indication information, and the indication information is used to indicate whether the first PPDU is a coordinately transmitted PPDU. the SIG-B field further comprises an AP selection field, and the AP selection field is used to indicate, to the first station, a data source of the data part of the first PPDU; and before the sending, by the first AP, the first PPDU, the method further comprises: sending, by the first AP, a beacon frame, wherein the beacon frame comprises a flag bit of the special BSS and AP indication information, wherein the flag bit of the special BSS is used to indicate that the special BSS is used for coordinated transmission, and the AP indication information is used to indicate an AP in the AP coordinated set, wherein the SIG-A field further comprises indication information, and the indication information is used to indicate whether the first PPDU is a coordinately transmitted PPDU. sending, by the first AP, a beacon frame, wherein the beacon frame comprises a flag bit of the special BSS and AP indication information, wherein the flag bit of the special BSS is used to indicate that the special BSS is used for coordinated transmission, and the AP indication information is used to indicate an AP in the AP coordinated set, wherein the SIG-A field further comprises indication information, and the indication information is used to indicate whether the first PPDU is a coordinately transmitted PPDU.