Control method and device of mobile terminal and mobile terminal

The invention discloses a control method and device of a mobile terminal and the mobile terminal. The method comprises the steps as follows: S1, acquiring a current display interface of the mobile terminal; S2, judging whether the current display interface is an interface corresponding to a communication application when the communication application of the mobile terminal runs, if yes, controlling the mobile terminal to keep the current state, otherwise, implementing step S3; S3, controlling the mobile terminal to run a program corresponding to a convenient reply floating window, and controlling the mobile terminal to display the convenient reply floating window when the communication application receives information; the convenient reply floating window is used for inputting reply information to the communication application to conduct reply after the communication application receives the information. When the current display interface of the mobile terminal is not the interface corresponding to the commun