A management apparatus, a charging object apparatus and a management system and method by which a product of an object of use can be used in an efficiency as high as possible when it is used commonly by a plurality of people. In the management system, the management apparatus includes a storage section into which reservation information including information regarding a use time of a charging object apparatus and information regarding a user is stored, an updating section for updating the reservation information stored in the storage section based on information that the user requests for reservation of use of the charging object apparatus, and a permission information signaling section for signaling, when the reservation information updated by the updating section is different from reservation information of any other user stored in the storage section, permission information for permitting use of the charging object apparatus to the outside based on the use reservation information stored in the storage section.