Electronic device for controlling watch face of smart watch and operation method therefor

An electronic device comprising:

• a touch screen;
• a camera;
• a communication module configured to communicate with a wearable electronic device;
• a processor;
• and
• memory storing instructions that, when executed by the processor, cause the electronic device to:
• based on identifying a request to change a watch face of the wearable electronic device, control the camera to obtain a first image by photographing the wearable electronic device displaying a first screen image together with an external background near the wearable electronic device when the wearable electronic device is worn by a wrist of a user, the first image comprising:
• a first portion of the first image corresponding to the first screen image that is displayed on a display of the wearable electronic device, the first screen image comprising a color pattern including a plurality of colors;
• and
• a second portion of the first image corresponding to the external background of the wearable electronic device, the external background being external to the first screen image and the external background including ambient brightness information of the wearable electronic device, a strap of the wearable electronic device, a skin of the user, and a cloth of the user;
• identify the first portion corresponding to the first screen image and the second portion corresponding to the external background, based on the first image;
• obtain at least one screen image, based on the color pattern included in the first portion of the first image, the ambient brightness information, a color of the strap of the wearable electronic device, a color of the skin of the user, and a color of the cloth of the user included in the second portion of the first image, and display, on the touch screen, the at least one screen image;
• identify a second screen image among the at least one screen image based on a user input on the touch screen, the second screen image being to be displayed on the display of the wearable electronic device as the watch face of the wearable electronic device and the second screen image being different from the first screen image;
• and
• in response to identifying the second screen image, control the communication module to transmit, to the wearable electronic device, information of the second screen image obtained by the electronic device such that the first screen image displayed on the display of the wearable electronic device is automatically changed to the second screen image.