Abstract: A focus servo apparatus for a multi-layer disc includes a focus driving unit for outputting a driving signal for performing a focus jump operation of pulling in a pick-up and moving a focus of the pick-up, a level holder for maintaining a driving signal level of the driving signal from the focus driving unit corresponding to a focus position when the focus of the pick-up is positioned at a corresponding data surface of a disc, an adder for adding the driving signal from the level holder and a driving signal from a main focus servo unit, and a switch for selectively outputting the driving signal of the main focus servo unit when the pick-up is pulled-in and an output signal from the adder when the focus of the pick-up is positioned at the data surface of the disc. The improved focus servo apparatus is capable of carrying out a stable focus servo operation by incorporating the level holder and a focus jump function.