Method, apparatus, and communication systems of updating user data are provided. Business flow data and conversation flow data of a first user are obtained. Whether the first user has completed a preset first business task is determined according to the obtained business flow data, and whether the first user has completed a preset first conversation task is determined according to the obtained conversation flow data. After determining that the first user has completed the preset first business task and the preset first conversation task, a user data update volume corresponding to a first task group is obtained and updated. The introduction of the task group can help to prevent cheating behaviors, and can help to improve security of updating user data. The introduction of the conversation task can help to improve utilization of network resources, and help to promote business growth and better precipitation of user relationship chains.