9. The method of claim 6 , further comprising: identifying an additional sorting criterion from among the remaining of the plurality of sorting criteria for sorting the plurality of searched contents into content groups based on corresponding metadata of the plurality of searched contents, wherein a number of content groups for the additional sorting criterion is second greatest, and wherein the displaying displays a first question based on the sorting criterion and a second question based on the additional sorting criterion, wherein the searching, in response to answers to the first question and the second question, searches for matching content corresponding to the answers to the first question and the second question from the plurality of contents, and wherein the displaying displays the content matching the answers to the first question and the second question.
6. A method of searching for content of a device, the device configured to store a plurality of contents and corresponding metadata, the method comprising: identifying a sorting criterion from among a plurality of sorting criteria for sorting the plurality of contents into a plurality of content groups based on the corresponding metadata, wherein the corresponding metadata associated with each content in a content group is similar to other metadata of other contents in the same content group, and a number of content groups for the identified sorting criterion is greatest; automatically generating a question based on the identified sorting criterion; displaying the question; in response to receiving an answer to the question, searching for matching content corresponding to the answer to the question from the plurality of contents in the device; and displaying the content matching the answer to the question.