Considering IoT environment, where even network nodes are having not only data transfer function but also data processing function, we are studying which processing entity should execute an IoT application and how to connect the processing entity with terminals requesting the application. Then, we show 4 types of traffic engineering (TE) to minimize delay by the selection of processor and the rearrange of route. Next, we evaluate the complexity of algorithm for each TE type and clarify the effectiveness of each TE in term of the reduction of delay for delay relatively sensitive application. Finally we map IoT applications with adoptable TE types.