A method and apparatus are provided for processing a document in a touch-sensitive device by performing a document locking function in order not to expose a specific portion that contains significant content requiring security or confidentiality in a document, and by unlocking a locked portion of a document. In the method, when a document locking input is detected from a displayed document, the displayed document is folded in a direction of a first drag input. Thereafter, when the first drag input is removed, the displayed document is locked by completing the folding of the displayed document.