A billing management system includes an image forming apparatus and a billing management apparatus. The image forming apparatus includes a process information receiving unit for receiving process information indicating a list of processes in a process flow; a registration unit for transmitting identification information for the process flow to the billing management apparatus; a process execution unit for performing a first process assigned to the image forming apparatus; a billing information transmitting unit for transmitting billing information for the first process to the billing management apparatus; and a data transfer unit for transferring output data of the first process to a service providing apparatus that is to perform a second process. The billing management apparatus receives the billing information for the first and second processes from the image forming apparatus and the service providing apparatus and records the billing information in association with the identification information.