A method for processing an abusing message in an anonymous chatroom includes providing a rule set of a latest version to an administrator terminal of the anonymous chatroom when the administrator terminal logs in to an account through a message application or enters the anonymous chatroom, receiving a new message in the anonymous chatroom, providing the new message to the administrator terminal, receiving a request for hiding the new message from the administrator terminal when the new message is determined to be an abusing message based on at least one of a spam keyword and the rule set stored in the administrator terminal, and transmitting a command to hide the new message to a user terminal that joins the anonymous chatroom according to the request for hiding the new message.