A management apparatus configured to communicate with a device information transmitting apparatus via a communication network under a predetermined communication condition (A1, A2, A3 ···), the device information transmitting apparatus being configured to transmit device information (D1, D2, D3 ···) which is information about a predetermined device, and control the predetermined device, the management apparatus comprising: a first measuring unit configured to measure communication quality in the communication network; a first determining unit configured to determine a degree of decrease in the communication quality; and a first control unit configured to execute first control in accordance with the degree of decrease in the communication quality, wherein, in the first control, the first control unit is configured to change the communication condition in accordance with a degree of priority of each of pieces of information transmitted between the device information transmitting apparatus and the management apparatus, characterized in that: the management apparatus is further configured to communicate with, via the communication network, a predetermined information output terminal which is associated with the device information transmitting apparatus and configured to transmit a request related to the predetermined device to the management apparatus; and the management apparatus further comprises a first notifying unit (33, 344) configured to, when the first control unit executes the first control, notify the predetermined information output terminal that the first control is being executed such that a user using the predetermined information output terminal is able to recognize the execution of the first control. a first measuring unit configured to measure communication quality in the communication network; a first determining unit configured to determine a degree of decrease in the communication quality; and a first control unit configured to execute first control in accordance with the degree of decrease in the communication quality, wherein, in the first control, the first control unit is configured to change the communication condition in accordance with a degree of priority of each of pieces of information transmitted between the device information transmitting apparatus and the management apparatus, characterized in that: the management apparatus is further configured to communicate with, via the communication network, a predetermined information output terminal which is associated with the device information transmitting apparatus and configured to transmit a request related to the predetermined device to the management apparatus; and the management apparatus further comprises a first notifying unit (33, 344) configured to, when the first control unit executes the first control, notify the predetermined information output terminal that the first control is being executed such that a user using the predetermined information output terminal is able to recognize the execution of the first control. the management apparatus is further configured to communicate with, via the communication network, a predetermined information output terminal which is associated with the device information transmitting apparatus and configured to transmit a request related to the predetermined device to the management apparatus; and the management apparatus further comprises a first notifying unit (33, 344) configured to, when the first control unit executes the first control, notify the predetermined information output terminal that the first control is being executed such that a user using the predetermined information output terminal is able to recognize the execution of the first control.