US Patent 7508795 Data processing unit, data processing method and data processing system

During operation a check is made, by utilizing a tuning function of tuning communication parameters, if communication parameters used for wireless communication with another movable unit are suitable. When the communication parameters are found to be unsuitable, new communication parameters are used for communication. Thus, the communication performance of the movable unit is improved to significantly reduce the steps to select the optimum communication parameters and permits the communication parameter selection while confirming the reliability of each communication parameter.