Service discovery method and device in neighbor awareness network

Provided in embodiments of the present invention are a service discovery method and device in a neighbor awareness network (NAN). The method comprises: obtaining, by a first apparatus, change information in the NAN, and generating, according to the change information and first service information, a first service identifier, the change information comprising: global change information in the NAN, or local change information of the first apparatus; and transmitting a service message to a second apparatus, the service message comprising the first service identifier. The embodiments of the present invention improve security.