The present invention makes it possible to see an original text string which (i) is contained in a captured image and (ii) has been translated, even after a translation of the original text string is displayed. The text string decoration display control section (12) decorates a part indicating a text string contained in a captured image and causes the decorated part to be displayed. The translation image generating section (13) generates a translation image showing a result of translating the text string into another language. The translation display control section (16) switches between display and non-display of the translation image in accordance with an input carried out by a user.