A game apparatus, when receiving an input of an input character by a user, obtains and displays option character strings corresponding to the input character. The option character strings displayed here are option character strings that are connectable to a word preceding the input character. Displayed as the option character strings in this manner are only character strings, each of which does not form an inappropriate expression when connected to the word preceding or following the input character. When the user has selected an option character string from these option character strings, the game apparatus determines the option character string to be a fixed character string, and displays and stores the fixed character string.