“Concern for Others: CFO” which is an element of evaluating teamwork in real time. In most of the studies, the teamwork evaluation was analyzed by using questionnaire after an experiment. When teamwork skill requires assisting, those methods cannot apply in real time and objectively. Therefore, we had been suggested a method to real-time analyzing objective teamwork support by the CFO. In previous research, we revealed the sum and subtract of CFO were affected by force interaction when the cooperative task. Then, in this research, we analyzed temporal changes in an operator for the cooperative task using the sum and subtract of CFO, for considering a method for assisting the teamwork in real time by force feedback, visual assist, etc. As a result, a positive correlation was seen between the cooperative task time and the sum and subtract of CFO. And each section shows to tend of increase one of the operator's input change with time by an intervention of the others input. These tendencies suggests the teamwork can be assisted by increasing the sum of CFO referring to the subtract of CFO.