Maintenance management work support device and maintenance management work portable terminal

In an auxiliary server (60) as a maintenance management work auxiliary device, attribute data indicating attributes related to building equipment or maintenance management work and processing object data used in the maintenance management work are acquired from a portable terminal (20) used in the maintenance management work of the building equipment (S16). Then, in accordance with a selection rule set for the attribute, an information processing service to be executed is selected from among a plurality of information processing services of the same type provided by a plurality of external systems (130, 140, 150) (S20). Next, an API corresponding to the selected information processing service is called, data to be processed is transmitted, and execution of the information processing service is requested (S26). Further, an execution result of the information processing service is received through the API (S28). The received execution result of the information processing service is transmitted to the mobile ter