An object is to create a convergent mediation system (10) and method that meet the technical requirements of low latency time and high throughput, without compromising the interoperability and ease of administration of the system. According an aspect of the invention, these objects are achieved by providing a convergent mediation system (10) that comprises a common platform (18) providing processing power for both online processing (12) and off-line processing (14) of data. The convergent mediation system (10) is also provided with a system controller (110) that is adapted to dynamically allocate the processing power of the common platform (18) for the online processing (12) and off-line processing (14) of data.