1. A method for a device to enlarge a displayed font, comprising: receiving an instruction for enlarging a currently displayed font; acquiring a size of the currently displayed font; when the size of the currently displayed font is smaller than a preset maximum threshold, enlarging the currently displayed font based on a curve enlargement rule with a first enlargement coefficient configured by an operating system of the device and a second enlargement coefficient configured by a current application; when the size of the currently displayed font is larger than or equal to the preset maximum threshold, enlarging the currently displayed font based on a linear enlargement rule with a third enlargement coefficient configured by the operating system; and displaying the enlarged font.
2. The method according to claim 1 , wherein the enlarging of the currently displayed font comprises: enlarging the currently displayed font based on one of a parabolic enlargement rule, an elliptical enlargement rule, or a circular enlargement rule with the first enlargement coefficient configured by the operating system and the second enlargement coefficient configured by the current application.