The aim of this study is to propose data flow and develop a system that automatically updates schedules through the use of projectmanagement software—in particular, Microsoft Project, which is one of the well-known project-scheduling tools—and generate and display critical schedule information regarding the activities to which the project manager should pay special attention. To measure the actual progress, the method proposed by Kim et al. (2013a) is applied. However, the three-dimensional (3D) registration method proposed by Kim et al. (2013a) was improved upon so that it would be suitable for large-scale 3D point clouds. In addition, this study proposes a new method that can be used to identify the status of individual activities, update the schedule, and provide critical schedule information. Once collecting as-built data froma construction site is done, the proposed system uses 3D point-cloud data from a construction site and a four-dimensional (4D) model that includes an as-planned schedule as input data. Then, the proposed system automatically compares the planned progress against the actual progress on each component, measuring the actual progress on each activity, updating the start and finish dates for each activity, and providing critical schedule information.