Communication system

A communication system comprising:

• housing equipment;
• a relaying apparatus that communicates with the housing equipment;
• and
• a management device that is connected to a communication network and communicates with the relaying apparatus via the communication network and a wireless LAN router connected to the communication network,
• wherein the management device associates identification information of the relaying apparatus and identification information of the wireless LAN router with user identification information of a communication terminal that communicates with the management device via the communication network in predetermined processing,
• the management device stores these pieces of information as association information,
• the management device includes a control configuration that permits the stored association information to be used,
• while the association information is permitted to be used, when the identification information of the relaying apparatus and the identification information of the wireless LAN router are sent from the relaying apparatus to the management device, the management device determines whether the identification information of the wireless LAN router sent to the management device after the storage matches the identification information of the wireless LAN router associated with the identification information of the relaying apparatus by comparing the identification information of the wireless LAN router received by the management device with the stored association information,
• in a case where the identification information of the wireless LAN router received by the management device does not match the stored association information, the management device is configured to disable the association information, and
• upon receiving request information related to the housing equipment together with the user identification information from the communication terminal, the management device is configured to perform processing corresponding to the request information, only when the association information including the received user identification information is valid.