1. An electronic device comprising: a display module; a dictionary storage module which stores dictionary data that causes a plurality of entry words including compound words obtained by connecting a plurality of words to correspond to explanatory information on the entry words; a common word list display module which retrieves entry words for compound words from the entry words in the dictionary storage module, lists words common to the retrieved compound words, and displays the listed words on the display module; a compound word list display module which reads, from the dictionary data, entry words for compound words connecting with a word specified by a user operation in a list displayed on the common word list display module and displays the entry words for the compound words in list form on the display module; and an explanatory information display module which reads a corresponding piece of explanatory information from the dictionary data when a compound word has been specified according to a user operation in a compound word list displayed on the compound word list display module and displays the corresponding piece of explanatory information.