a plurality of charged state acquisition units that are provided with respective ones of a plurality of battery modules, acquire charging information of the plurality of battery modules, and are capable of forming an information transmission path for the charging information through radio communication therebetween;

a monitoring unit that monitors the plurality of battery modules on the basis of the charging information input via the information transmission path; and

a path selection unit that selects a charged state acquisition unit forming the information transmission path from the plurality of charged state acquisition units to the monitoring unit on the basis of the charging information, in a mesh network including radio lines connecting among the plurality of charged state acquisition units and radio lines connecting between the plurality of charged state acquisition units and the monitoring unit.