The present disclosure provides a wearable device that can be attached to or detached from a user. The wearable device includes a first display having a first size, a processor, and a memory storing instructions thereon that, when executed, allow the processor to display, through the first display, a user interface for obtaining a text input, transmit, to an external device that includes a second display having a second size, a request for obtaining the text input through the external device, receive, from the external device, input information related to the text input obtained through the external device, and display the received input information in the user interface.