A method and apparatus for data communication in wireless power transmission are provided. A cultivator point is adapted to be engaged with the adaptor and has a mounting section and a forward ground-working edge. The apparatus counts a number of connections between all of the information processing apparatuses on the network based upon the network structure, and controls the communication timing of the information apparatuses on the network based upon the number of connections. Each group is allowed to use only resources whose rights to use are allocated to the group. This results in preventing breakage of the electrical connection via the electroconductive members in the through holes.