The purpose of this study was to seek an effective utilization for mutually beneficial communication using the features of the application between mother-teacher, and to provide an alternative plan for concerns on privacy, personal information exposure and fragmented/formal communication through in-depth analysis of the experience of mothers and teacher that participated in the communication by reviewing specific cases of bilateral communication using the early childhood institution application. Issues according the purpose of this study were as follows: 1. How was the teacher-mother communication experience using the communication application? 1-1. How was the mother’s experience in the teacher-mother communication experience using the communication application? 1-2. How was the teacher’s experience in the teacher-mother communication experience using the communication application? The group of mothers participated in this study consists of fifteen mothers of children under the age of five attending B public kindergarten located in I City of Gyeonggi-do. This study was performed flexibly depending on mothers’ communication within ten weeks, from September 22, 2014 through December 7, 2015. The data was collected by various methods, which include observation recordings and transcripts, individual/group discussions, communication data, surveys, and research material using communication application. The results obtained from this study are as follows. First, communication through the communication application between teacher-mother enhanced the existing limitation, and assisted in activating communication. In other words, it maximized the benefits of immediacy and portability of smartphones, and provided environment for a continuous and two-way communication between teacher and mother through various features on the early childhood institution application. Second, communication through the application is beneficial for all teachers, mothers, and children. In other words, teachers can inform mothers on the ongoing activities at the institution, and also gain a chance to know children’s education style at home and family’s characteristics. In addition, mothers can provide adequate assistance for children’s growth and development through understanding preschool education and having a more objective perspective on the child. Continuous communication between teachers and mothers lead all teachers, mothers, and children to a positive direction. Third, when effectively utilized, communication application can allow consultation and detailed discussion on children between teacher and mother. This also disregards concerns on privacy and exposure of unnecessary personal information when communicated via mobile instant messengers and SNS. However, it is necessary to be utilized along with other communication tools for a more effective communication. Fourth, communication through the communication application provides basis for mutual understanding and trust between teacher and mothers by understanding each other’s roles. Furthermore, through sharing emotions, the application can allow them to develop a new relationship by emotionally supporting each other and treating each other as partners.