Maintenance management system, message control apparatus, message control method, and program

A maintenance management system comprising:

• a plurality of operation component devices that transmit and receive one or more messages and autonomously operate;
• and a message control device that controls the one or more messages transmitted and received among the operation component devices, the maintenance management system maintaining and managing a service, wherein
• each of the operation component devices executes a predetermined action when receiving a message addressed to the operation component device and, when the predetermined action is successfully executed, transmits, to a transmission source, a message to which a label allocated to the operation component device is given, and
• the message control device:
• receives the message transmitted by the operation component device;
• determines the operation component device at the transmission destination from a label given to the transmission source of the message;
• and
• transmits the message to the operation component device at the transmission destination.