A display device according to a disclosed embodiment comprises a display and a processor executing at least one instruction. The processor: causes a first camera set to a first angle of view to activate in response to a request to execute an application that provides a home training service; acquires a first image through the activated first camera; causes a second camera set to a second angle of view that is different from the first angle of view to activate in response to at least one object included in the first image being identified as a training target object; and provides a home training service on the basis of at least one image acquired through the second camera.