An electronic device, comprising: an image capturing device (220, 300); and a processor electrically connected with the image capturing device, wherein the processor is configured to: obtain a first portion of a video at a first capturing speed during a first period using the image capturing device (220, 300), when a capturing speed of the video is set to change to a second capturing speed from the first capturing speed based on a result of analyzing the first portion, set a first time for changing to the second capturing speed and a second time different from the first time, wherein the second time is within the first period and earlier than the first time, output, at the second time, first notification information notifying that the second portion of the video is to be obtained at the second capturing speed of the video, change to the second capturing speed from the first capturing speed at the first time, and output, at the first time, second notification information notifying that the capturing speed of the video is changed to the second capturing speed, and when the capturing speed of the video is changed to the second capturing speed from the first capturing speed, obtain a second portion of the video at the second capturing speed during a second period following the first time using the image capturing device (220, 300). an image capturing device (220, 300); and a processor electrically connected with the image capturing device, wherein the processor is configured to: obtain a first portion of a video at a first capturing speed during a first period using the image capturing device (220, 300), when a capturing speed of the video is set to change to a second capturing speed from the first capturing speed based on a result of analyzing the first portion, set a first time for changing to the second capturing speed and a second time different from the first time, wherein the second time is within the first period and earlier than the first time, output, at the second time, first notification information notifying that the second portion of the video is to be obtained at the second capturing speed of the video, change to the second capturing speed from the first capturing speed at the first time, and output, at the first time, second notification information notifying that the capturing speed of the video is changed to the second capturing speed, and when the capturing speed of the video is changed to the second capturing speed from the first capturing speed, obtain a second portion of the video at the second capturing speed during a second period following the first time using the image capturing device (220, 300). obtain a first portion of a video at a first capturing speed during a first period using the image capturing device (220, 300), when a capturing speed of the video is set to change to a second capturing speed from the first capturing speed based on a result of analyzing the first portion, set a first time for changing to the second capturing speed and a second time different from the first time, wherein the second time is within the first period and earlier than the first time, output, at the second time, first notification information notifying that the second portion of the video is to be obtained at the second capturing speed of the video, change to the second capturing speed from the first capturing speed at the first time, and output, at the first time, second notification information notifying that the capturing speed of the video is changed to the second capturing speed, and when the capturing speed of the video is changed to the second capturing speed from the first capturing speed, obtain a second portion of the video at the second capturing speed during a second period following the first time using the image capturing device (220, 300).