A data processing device, such as a handy translating device which translates specific phrases into corresponding phrases in another language system or, such as a retrieving device which retrieves specific phrases containing words. The data processing device includes a phrase storing unit for storing phrases each consisting of one or more words in a state that label data relating to the phrase is attached to the phrase, a retrieval word input unit for inputting a retrieval word, a label data retrieving unit for retrieving a phrase with the same label data as the retrieval word from among the phrases in the phrase storing unit, a display unit, and a display control unit for controlling an operation of the display unit for displaying the phrase retrieved by the label data retrieving unit.