ITT refers to the transshipment of cargo between container terminals in the port. In Busan New Port, the volume of transshipment cargo has increased significantly, accounting for 60%. Recently, Korean government is aware of the importance of ITT and it is preparing for ITT implementation. Therefore, this paper presents the current status and implementation problems of domestic ITT and suggests a model that can reduce the congestion of vehicles waiting time among the transshipment between container terminals. By comparison of the vehicle booking system which works for only one terminal, the model of this paper coniders multiple inbound and outbound terminals. The experimental data set was created by the field data and the model was verified by comparing the existing field results and the model results.