An apparatus and method for controlling an electrical stimulation system to increase the resolution of the stimulation region with multiple independent power source electrodes is proposed. In the apparatus, the electrode set contains at least three electrodes of which two adjacent electrodes are of the same power polarity to control the location of the composite stimulation signal and the others are of an inverse power polarity to balance the total power polarity and narrow the stimulation region. The method for the apparatus comprises steps of: receiving a target stimulation location and level, generating at least one parameter to adjust power settings of the electrodes, thereby obtaining a composite stimulation signal corresponding to a virtual channel of which a location and level match the target stimulation location and level.本發明提出一種使用多個獨立電源電極來控制電刺激系統以增進刺激區域解析度的新裝置及方法。該裝置中對應電極組包含至少三個電極，且其中有二個相鄰電極具有相同極性電源，用以控制整合刺激訊號的位置，而其他電極則是相反極性電源，用以平衡總電源量及縮減刺激區域。該方法至少包含下列步驟：接收一目標刺激位置及大小及產生至少一個控制參數來調整該對應電極的輸入電源值以得到符合該目標刺激位置及大小的整合刺激訊號。
