According to an embodiment of the disclosure, an electronic device may include a housing including a first housing and a second housing receiving at least a portion of the first housing and configured to guide a slide of the first housing, a display including a first display area disposed on the second housing and a second display area extending from the first display area, a speaker module disposed in the housing, a resonance space facing at least a portion of the speaker module and configured to vary in size based on a slide of the first housing with respect to the second housing, and a processor configured to adjust a sound output from the speaker module based on the size of the resonance space.