A charging control apparatus, a method, and a system are disclosed. When a user equipment (UE) accesses a service that charges an over the top (OTT) service (SP), the charging control apparatus receives flow description information from a policy charging enforcement function (PCEF), determines a service identifier corresponding to the data flow; and sends the service identifier to the PCEF, so that the PCEF charges for the service according to the service identifier. When the UE accesses the service, the PCEF may obtain the service identifier from the charging control apparatus. In this way, the PCEF can obtain the service identifier and the charging identifier that are corresponding to the data flow. Therefore, a configuration workload can be decreased.