The invention provides a memory management system and a memory management method. The memory management system comprises a judging unit and a memory management unit, wherein the judging unit is used for judging whether a current operating application program is a preset core service application program when the current operating application program quits a foreground, and the memory management unit closes the application program to release the occupied internal memory when the current operating application program is not the preset core service application program. Through the technical scheme, electronic equipment with a small internal memory can guarantee key service of the memory management system and real-time performance of application, and guarantees normal operation of non-core application programs and system stability.