A method for inviting to join a group in communication field, particularly relates to a method for joining a group is provided, which mostly includes steps: receiving a request for inviting a member to join a group send by a group management terminal; sending an invite message to the invited new member; receiving response message returned by the invited new member according to the invite message; modifying the status of the new member according to the response message; returning the invite result message to the group management terminal. A method for joining a group actively and a group system also are provided. It realizes the management terminal invites new member to join a group and new member joins a group actively. It can combine to produce more service, rich in experience of member by the function.
