Provided are an electronic device and an operation method thereof. The electronic device may include a memory storing one or more instructions, and a processor configured to execute the one or more instructions stored in the memory to: analyze a meaning of a speech section in audio data included in a content being played on the electronic device, based on an analysis result of the speech section, identify, from among a plurality of image frames included in the content, an image candidate section for generating a highlight image, analyze an object included in an image frame corresponding to the image candidate section, and identify a target section for generating the highlight image based on an analysis result of the image candidate section.