1. A non-transitory computer-readable storage medium for storing an acronym-management program for causing a computer to function as: a list-managing device that manages an acronym list in which an acronym, an expanded form corresponding to the acronym, and the frequency with which the acronym is used to refer to the expanded form are correlated; function as an acronym-extracting device that extracts the acronym from a list-updating reference for updating the acronym list; function as an expanded-form-extracting device that extracts, from the list-updating-reference, a candidate for the expanded form corresponding to the acronym extracted from the list-updating reference; and function as the list-managing device that increases, in the acronym list, the frequency correlated with the acronym and the expanded form when the likelihood of the acronym extracted from the list-updating reference being used in the list-updating reference to refer to the extracted expanded-form candidate reaches or exceeds a specific level.