The present invention provides a method for establishing an enterprise group and a corresponding apparatus. According to an example, an IM application server may determine, according to a received join-group request for adding a first user to an inside group, whether identity information of the first user matches attribute information of the inside group. If the identity information of the first user matches the attribute information of the inside group, the server may add the first user to the inside group, and send a first notification message to a client corresponding to the first user. If the identity information of the first user does not match the attribute information of the inside group, the server may create an inter-enterprise group including the first user and all members of the inside group, and send a second notification message to the client corresponding to the first user.
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