A management device includes a storage unit which stores both an attribute value before correction and an attribute value after correction concerning a configuration item as a management target and type information of the configuration item or relationship information between the configuration item and another configuration item; a determination unit which, when an attribute value input for a new configuration item coincides with the attribute value before correction stored in the storage unit, determines a degree of coincidence between type information or relationship information input for the new configuration item and the type information stored in the storage unit or the relationship information stored in the storage unit; and an output unit which outputs the attribute value after correction based on the determination result of the determination unit.