1. An electronic device comprising: a user authentication module; a display; a memory configured to store at least one theme data applicable to a page and instructions; and a processor, the processor being configured to execute the stored instructions to: control the display to display the page which first theme data is applied to, wherein the first theme data comprises first theme resource data, control the user authentication module to obtain user authentication information, determine second theme data corresponding to the obtained user authentication information, extract second theme resource data from the second theme data, determine a similarity of the first theme resource data and the second theme resource data, apply the second theme data to the page, and when the similarity is greater than a specified value, provide a guide for the first theme resource data to an object.