The present invention relates to an electronic document reproduction apparatus supporting a preview function upon outputting an electronic book, and a reproducing method thereof. The electronic document reproduction apparatus includes: an input/output unit for outputting contents of an electronic document and receiving a user's instruction from a user; a storage unit for storing data of the electronic document; and a controller for searching for an output position of a corresponding electronic document according to the users instruction input through the input/output unit, and displaying the corresponding electronic document, wherein the controller receives a preview execution instruction through the input/output unit and provides a preview function for a corresponding position to the electronic document, and the controller receives a page selection instruction and sets a corresponding page as an output position.