The Learner Information System is an online service that the Department of Education in the Philippines used to manage learner's information and improve the collaboration of all personnel in the organization. However, there is a need to examine the user's actual use, attitude, and behavior towards the system and to understand the factors affecting its successful implementation to improve the system capabilities and cater teacher and learner increasing needs. Using the extended technology acceptance model (TAM), this work analyzed 127 datasets gathered from 45 public and private schools in the Philippines using structural equation modelling in partial least squares. The result shows that system quality and facilitating conditions are significant predictors of teachers' attitudes towards the system. Generally, all original constructs of TAM were found to be significant implying a positive acceptance of the Learner Information System. These results provide further evidence in understanding the user acceptance of ICT-based teaching-learning systems in the Philippines.