When a process of searching for assets stored in a memory card is selected, a controller of a printer sets searching icons associated with previously set searching-keywords as current searching icons (S110), and each time a memory card is installed in a reader/writer, acquires all keywords associated with assets, which are search objects, from the installed memory card (S170), collates the set searching-keywords with the acquired keywords (S200), and displays searching-keywords among the set searching-keywords, that do not match any of the acquired keywords in a manner that differs from a normal display (S210). A user can thus recognize that a searching-keyword that has been set is not contained in the memory card 18 before the user executes an actual search.