Using amount prompting method and business operation support system

The invention discloses a using amount prompting method. The using amount prompting method comprises the following steps that: when any user X uses a business, a business operation support system (BOSS) performs charging processing once every time when receiving a charging message, and updates the stored using amount information of the user X according to a charging processing result; and the BOSS determines whether a using amount prompting message is required to be transmitted or not according to a pre-stored prompting rule, generates the using amount prompting message according to the using amount information of the user X if the using amount prompting message is required to be transmitted, and transmits the using amount prompting message.