In the method, a server obtains data of a first communication ID, where the first communication ID is associated with a first device ID and a first account ID; detects whether the first communication ID is a suspected harassment communication ID; in response to that the first communication ID is the suspected harassment communication ID, obtains a second communication ID, where the second communication ID includes a communication ID associated with the first device ID and a communication ID associated with the first account ID; detects, based on data of the second communication ID, whether the second communication ID is the suspected harassment communication ID; and in response to that the second communication ID is the suspected harassment communication ID, bans the first device ID, the first account ID, and a second device ID and a second account ID that are associated with the second communication ID.