A group trigger system, comprising: an interworking function, IWF, entity which is responsible for interworking between an external network and a 3GPP network, configured to send a trigger delivery request to an entity that has a group trigger function; the entity that has a group 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 deliver an acquired group trigger payload to a user equipment, UE, according to the trigger delivery request; a service capability server, SCS, configured to send a trigger request message to the IWF entity, characterized in that the trigger request message comprises external group identifier information, location information, and a group trigger payload, so that the IWF entity sends a subscriber information verification request message to a home subscriber server, HSS, to perform subscriber information verification, wherein the subscriber information verification request message comprises the external group identifier information and identification information of the SCS; and the HSS, configured to, after receiving the subscriber information verification request message sent by the IWF entity, judge, according to the external group identifier information and the identification information of the SCS, whether to perform a trigger operation of the SCS; and if yes, map the external group identifier information to internal group identifier information of an operator, and add the internal group identifier information of the operator and an indication of a determined group trigger delivery manner to a subscriber information verification response message to send to the IWF entity, so that the IWF entity selects a group trigger delivery manner according to the indication of the group trigger delivery manner and/or a local policy to send the trigger delivery request to the corresponding entity that has a group trigger function. an interworking function, IWF, entity which is responsible for interworking between an external network and a 3GPP network, configured to send a trigger delivery request to an entity that has a group trigger function; the entity that has a group 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 deliver an acquired group trigger payload to a user equipment, UE, according to the trigger delivery request; a service capability server, SCS, configured to send a trigger request message to the IWF entity, characterized in that the trigger request message comprises external group identifier information, location information, and a group trigger payload, so that the IWF entity sends a subscriber information verification request message to a home subscriber server, HSS, to perform subscriber information verification, wherein the subscriber information verification request message comprises the external group identifier information and identification information of the SCS; and the HSS, configured to, after receiving the subscriber information verification request message sent by the IWF entity, judge, according to the external group identifier information and the identification information of the SCS, whether to perform a trigger operation of the SCS; and if yes, map the external group identifier information to internal group identifier information of an operator, and add the internal group identifier information of the operator and an indication of a determined group trigger delivery manner to a subscriber information verification response message to send to the IWF entity, so that the IWF entity selects a group trigger delivery manner according to the indication of the group trigger delivery manner and/or a local policy to send the trigger delivery request to the corresponding entity that has a group trigger function.