5. The image processing apparatus according to claim 3 , wherein: the display unit is further configured to display the setting information as an image for designating a link destination of the character string retrieved by the character search unit; and the link setting unit is further configured to set the character string designated in response to the operation of the user as the link destination.
3. The image processing apparatus according to claim 1 , further comprising: a display unit configured to display setting information for linking the character string; and an operation unit configured to receive an operation of a user performed for the setting information displayed in the display unit.