The invention provides a method for prompting a group message in an instant messaging tool. The method comprises the following steps: a local instant messaging tool receives the group message from another instant messaging tool; the local instant messaging tool analyzes the group message; the local instant messaging tool judges whether a part of the group message meets a prompting strategy according to an analysis result; if a part of the group message meets the prompting strategy, the local instant messaging tool sends a prompt to a user. The invention further provides the instant messaging tool and a client side. According to the method, the instant messaging tool and the client side, the group message mentioning the user is specially treated and processed so that the user can only process the group message mentioning the user, as a result, user experience of the instant messaging tool is improved, and convenience is brought to the user.