The present disclosure provides a method and apparatus for providing service provider identity, an access device and a terminal device. The method includes: determining a second-format second participating service provider identity (PSP-ID) corresponding to a first-format first PSP-ID of a service provider to be accessed; obtaining a second-format third PSP-ID sent from a first access device; when the third PSP-ID includes the second PSP-ID, selecting the first access device to access the service provider; or, obtaining the second-format third PSP-ID sent from the first access device, determining a first-format fourth PSP-ID that is supported by the first access device and is corresponding to the third PSP-ID; when the fourth PSP-ID includes the first PSP-ID, selecting the first access device to access the service provider.