A searching device includes a history storing unit storing a search target obtained by a search and a search date in a storage unit; a relevancy storing unit storing in the storage unit a previous searching keyword including a plurality of date-related words as well as the search target and an attribute of the search target in association with one another; a change unit changing the previous searching keyword, based on the search date stored in the storage unit and a date output from a clock unit; a reception unit receiving a previous searching keyword and the search target or attribute that are entered by voice; and an extraction unit extracting a search target corresponding to the previous searching keyword and the search target or attribute received by the reception unit, by referring to the previous searching keyword that is obtained after changing, the search target and the attribute.