Until now, when practicing facial expression recognition skills in nonverbal communication areas of SST, judgment of facial expression was not quantitative because the subjects of SST were judged by teachers. Therefore, we thought whether SST could be performed using facial expression detection devices that can quantitatively measure facial expressions. In this research, we developed an application software using a facial expression recognition device connected to a smartphone and a practice book. With opening the book, one situation is described. A student makes a facial expression as he/she thinks is best. Our application judge's the expression and gives feedback of whether it is proper or not. A total of 28 students practiced it at two visual support schools and a class guidance classroom. As a result, all of the students were able to repeatedly make their intended face expression each time they tried. And from the observations and interviews with the students, we found the students were pleased and proud with the result. [For the complete proceedings, see ED579395.]