A multihop wireless network includes a plurality of wireless nodes. Each wireless node calculates a metric value indicating a quantity of providing a guideline for selecting a superordinate destination node with each candidate for the superordinate destination node when carrying out a multihop wireless communication with a specific wireless node based on peripheral node information about node information received from the peripheral wireless nodes and determines the superordinate destination node based on the calculated metric value. The network system selects a superordinate wireless node as a target wireless node expected to change the number of the wireless nodes existing in a subordinate hierarchy, and intentionally changes a value of the node information sent from the target wireless node to the peripheral wireless nodes.