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.