A library apparatus includes a drive unit for writing data into or reading data from a cartridge, a cell unit having a plurality of cells to store the cartridges and a bottom plate in which a guide groove is formed, a movement unit for moving the cartridge along the guide groove between the cell and the drive unit, the movement unit being arranged under the cell unit, and a control unit for controlling the movement unit to move up through the guide groove, to engage the cartridge, and to move the engaged cartridge.