A transmission system for transmitting data between a controlling terminal and a controlled terminal is provided. The transmission system includes a first electronic apparatus, a second electronic apparatus and a transmission apparatus. The first and second electronic apparatus comprise first and second application programs, respectively. The transmission apparatus, coupled to the first and second electronic apparatus via first and second interfaces, respectively, determine one of the first and second electronic apparatuses as the controlling terminal and the other as the controlled terminal according to coupling sequences of the first and second electronic apparatuses. The first and second application programs determine an initial transmission profile according to respective feature information of the first and second electronic apparatuses detected, and continue to detect respective transmission utilization rates with the transmission apparatus and utilize the respective transmission utilization rates as reference for whether to dynamically adjust subsequent transmission profiles.