A management apparatus includes: a receiver that receives, via a network, status data based on control system data for stabilizing image forming from an image forming apparatus formed by image forming units; an inference unit that determines abnormality occurrence symptom, and calculates an index of the abnormality occurrence symptom, of the image forming units based on the received status data; a replacement part information acquisition unit that acquires information including a replacement date from a maintenance management system via the network when receiving a diagnosis request from a terminal of a maintenance person; a judgment table generator that calculates weight information of the symptom determination index value; a integrated diagnostic information generator for the image forming units based on the symptom determination index value and the weight information; and a integrated diagnostic information notification unit transmitting the integrated diagnostic value information to the terminal of the maintenance person.