A network system comprising: multiple printers ; multiple monitoring devices configured to monitor a state of the printers and an information processing device configured to communicate with the monitoring devices ; the monitoring devices each having a function of communicating with multiple printers and monitoring a state of the multiple printers , and sending to the information processing device , for one or more of the monitored printers , printer state information related to the state of the respective monitored printer , wherein: each monitoring device is configured to request, at an interval, from one ormore of the monitored printers , a response of printer state information related to the printer state of the respective monitored printer , to receive the printer state information in response to the request, and to send the received printer state information to the information processing device ; the information processing device is configured to manage the printer state based on the printer state information received from the monitoring device ; and characterized in that each of the printers is configured to, when requested for a response of the printer state information from different monitoring devices , send a control command to instruct stop sending response request data for printer state information to all but one predetermined monitoring devices , thus reducing the number of monitoring device to one. multiple printers ; multiple monitoring devices configured to monitor a state of the printers and an information processing device configured to communicate with the monitoring devices ; the monitoring devices each having a function of communicating with multiple printers and monitoring a state of the multiple printers , and sending to the information processing device , for one or more of the monitored printers , printer state information related to the state of the respective monitored printer , wherein: each monitoring device is configured to request, at an interval, from one ormore of the monitored printers , a response of printer state information related to the printer state of the respective monitored printer , to receive the printer state information in response to the request, and to send the received printer state information to the information processing device ; the information processing device is configured to manage the printer state based on the printer state information received from the monitoring device ; and characterized in that each of the printers is configured to, when requested for a response of the printer state information from different monitoring devices , send a control command to instruct stop sending response request data for printer state information to all but one predetermined monitoring devices , thus reducing the number of monitoring device to one. each monitoring device is configured to request, at an interval, from one ormore of the monitored printers , a response of printer state information related to the printer state of the respective monitored printer , to receive the printer state information in response to the request, and to send the received printer state information to the information processing device ; the information processing device is configured to manage the printer state based on the printer state information received from the monitoring device ; and characterized in that each of the printers is configured to, when requested for a response of the printer state information from different monitoring devices , send a control command to instruct stop sending response request data for printer state information to all but one predetermined monitoring devices , thus reducing the number of monitoring device to one. <EOS>