A group trigger method, apparatus, and system include an interworking function IWF entity, configured to send a trigger delivery request to an entity that has a trigger function; and the entity that has a trigger function, configured to, after receiving the trigger delivery request sent by the IWF entity, return a trigger delivery acknowledgement message to the IWF entity, and delivers, according to the trigger delivery request, an acquired group trigger payload to a user equipment UE. The entity that has a group trigger function delivers the group trigger payload to the UE, so as to effectively implement group trigger, avoid point-to-point trigger, and save system resources.