A method, implemented by a terminal including a display interface, a camera and a direction sensor, the method comprising the steps of: starting the camera and acquiring an objective image through the camera, said starting step comprising: o detecting whether the terminal is in an inclined state relative to an horizontal plane using the direction sensor, wherein it is detected that the terminal is in said inclined state if an inclined angle measured by the direction sensor between the terminal and the horizontal plan falls within a preset angle range; and ∘ starting the camera to acquire an objective image through the camera only if it is detected that the terminal is in the inclined state; determining a facing direction of the camera based on posture angles of the terminal measured by the direction sensor around three axis x, y and z of a coordinate system of said terminal, said direction sensor being a gyroscope sensor and/or an accelerometer sensor, wherein the facing direction points perpendicularly from the front side of the terminal to the back side of the terminal; characterized in that the method further comprises the steps of: presetting a reference direction; calculating a deflecting angle value of the facing direction in respect to the reference direction; and displaying the deflecting angle value in the objective image on the display interface. starting the camera and acquiring an objective image through the camera, said starting step comprising: o detecting whether the terminal is in an inclined state relative to an horizontal plane using the direction sensor, wherein it is detected that the terminal is in said inclined state if an inclined angle measured by the direction sensor between the terminal and the horizontal plan falls within a preset angle range; and ∘ starting the camera to acquire an objective image through the camera only if it is detected that the terminal is in the inclined state; o detecting whether the terminal is in an inclined state relative to an horizontal plane using the direction sensor, wherein it is detected that the terminal is in said inclined state if an inclined angle measured by the direction sensor between the terminal and the horizontal plan falls within a preset angle range; and ∘ starting the camera to acquire an objective image through the camera only if it is detected that the terminal is in the inclined state; determining a facing direction of the camera based on posture angles of the terminal measured by the direction sensor around three axis x, y and z of a coordinate system of said terminal, said direction sensor being a gyroscope sensor and/or an accelerometer sensor, wherein the facing direction points perpendicularly from the front side of the terminal to the back side of the terminal; characterized in that the method further comprises the steps of: presetting a reference direction; calculating a deflecting angle value of the facing direction in respect to the reference direction; and displaying the deflecting angle value in the objective image on the display interface. presetting a reference direction; calculating a deflecting angle value of the facing direction in respect to the reference direction; and displaying the deflecting angle value in the objective image on the display interface.