Focusing method, device, and mobile terminal

A focusing method applied in a mobile terminal;

• the mobile terminal comprising a first camera having a first lens module and a second camera having a second lens module;
• the second camera being adjacent to the first camera;
• wherein correspondences of device identification number of every camera, a first in-focus position, a second in-focus position and an in-focus distance are pre-stored in the mobile terminal, the first in-focus position indicates a position at which the first lens module is in focus, and the second in-focus position indicates a position at which the second lens module is in focus, and the focusing method comprises:
• obtaining the device identification number of the first camera;
• searching for the in-focus distance corresponding to the first in-focus position, according to the device identification number of the first camera and the correspondences of device identification numbers of the first camera and the second camera, the first in-focus position, the second in-focus position, and the in-focus distance;
• obtaining the second in-focus position of the second lens module corresponding to the searched in-focus distance, wherein the second in-focus position indicates a position at which the second lens module is in focus;
• and
• driving the second lens module to move to the second in-focus position and to focus.