A laser control apparatus and control method thereof includes multiple laser elements, a photodetector for monitoring optical outputs of the laser elements, a modulation. circuit for modulating with respect to each laser element based on data, a first drive source for applying a bias current to each laser element, a second drive source for generating a modulation current in the modulation circuit, and a controller for controlling the first drive source and the second drive source to couple an amount of a variation of a drive current as a test current to the bias current and the modulation current and for controlling the bias current according to an amount of variation of the optical output which occurs by coupling of the test current and an amount of the bias current.