1. An oil pump control method, comprising: setting an initial target oil pressure of an oil pump based on a rotation speed of an engine or an oil temperature; determining a target torque or a target fuel quantity of the engine; determining a pressure compensation value by considering the determined target torque or target fuel quantity of the engine based on the initial target oil pressure; determining a final target oil pressure by adding the pressure compensation value to the initial target oil pressure; and feedback-controlling the oil pump so that current oil pressure measured in real time follows the final target oil pressure.