8. A mobile device comprising: at least one processor configured to create, when a number of words related to place names are selected in a reproduced electronic book (e-book), e-book auxiliary content that includes information regarding a map to which information regarding routes between place locations corresponding to the selected words is applied, with respect to at least one page containing the selected words; and a memory configured to store the e-book with the created e-book auxiliary content, wherein in response, when a user selects a predetermined item in a content items displaying area of a screen where the e-book auxiliary content is reproduced, the at least one processor is further configured to display on a detailed map information area, information regarding routes including development of a story flow from pages included in previous items to a corresponding page.
8. A mobile device comprising: at least one processor configured to create, when a number of words related to place names are selected in a reproduced electronic book (e-book), e-book auxiliary content that includes information regarding a map to which information regarding routes between place locations corresponding to the selected words is applied, with respect to at least one page containing the selected words; and a memory configured to store the e-book with the created e-book auxiliary content, wherein in response, when a user selects a predetermined item in a content items displaying area of a screen where the e-book auxiliary content is reproduced, the at least one processor is further configured to display on a detailed map information area, information regarding routes including development of a story flow from pages included in previous items to a corresponding page. 9. The mobile device of claim 8 , further comprising: a display configured to display a list of e-books.