image produced by the image superposition section 128 is outputted to the display block 130 and to the user the display block 130 is an outputting section for displaying an image the display block 130 can be configured for example using a liquid crystal display unit or an organic el electroluminescence display unit it is to be noted that the electronic book browsing device 100 according to the present embodiment may include a sound outputting section such as a speaker or the like as one of outputting sections the book database 140 stores book data representative of the substance of an electronic book in the book database 140 data of one or a plurality of books acquired through a medium or a network are accumulated the book data stored in the book database 140 are converted into data of a format which can be displayed on the display block 130 by the renderer section 122 the history information database 150 is a storage block for storing a word searched by the user using the dictionary function as history information the history information database 150 stores for example as illustrated in fig2 a word 151 searched using the dictionary function a search time number 152 representative of a.