PROBLEM TO BE SOLVED: To easily perform dictionary search by using a phrase divided by a desired unit as a search word when a character in a displayed text is designated to perform dictionary search in a dictionary search device.SOLUTION: When the range of a text including a phrase to be retrieved is selected according to a user's operation, the character string of the selection range H is subjected to syntax analysis, and divided into units of phrases present as dictionary entry words to be displayed. In this case, when the selection range H is selected as a range widened by pinching out each touch positions t1 and t2 multitouched within the range, a division unit of the phrase accompanying the syntax analysis is set small to divide the character string according to the sliding speed of the pinching out when the speed is slow, and conversely set large when the speed is fast to divide the character string. When a divided desired phrase is, for example, multitouched to be vertically slid at the touch positions t1 and t2, the multitouched phrase (word) is subjected to entry word search to be displayed.
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