PROBLEM TO BE SOLVED: To easily and surely set a traveling work parameter that defines traveling work of each work vehicle in a cooperative traveling work performed by a plurality of work vehicles in cooperation with each other at a work site. A communication processing unit 72 included in each work vehicle for performing data communication between at least a parent work vehicle and a child work vehicle； A difference data generation unit 43 that generates difference data indicating a difference between the work parameters. [Selection diagram] Figure 1【課題】複数の作業車が協調しながら作業地で行う協調走行作業において、各作業車の走行作業を規定する走行作業パラメータが簡単かつ確実に設定されること。【解決手段】各作業車に備えられ少なくとも親作業車と子作業車との間でデータ通信を行う通信処理部７２と、少なくとも親作業車に備えられ、各作業車の走行作業を決定する走行作業パラメータの間の相違を示す相違データを生成する相違データ生成部４３と、を備える。【選択図】図１
