1. Apparatus for displaying microfiche data, comprising manually actuable means for actuation by a user to indicate successive desired display regions of at least one microfiche from a set, the regions bearing information which the user needs, a microfiche reader comprising mechanical means for defining the coordinates of the regions to be displayed, means for projecting and presenting the information in said regions, and control means for controlling said mechanical means and said projecting and presenting means, said control means comprising a microprocessor for processing data entered by said manually actuable means, data relating to the operation of the different components of the apparatus and data associated with the information borne by the different regions of the microfiche, characterized in that said control means comprises memory means for storing said data, said microprocessor (31) being responsive to said stored data for transmitting to the different elements (35,37,39) of the apparatus the instructions necessary for presenting the information sought and also complementary information, said projecting and presenting means having means adapted to present a decision tree within which the user can continue his search according to indications contained in said complementary information.