An acquisition unit reads content including at least, (a) an image signal of an image frame defined by first and second directions, (b) first and second sizes showing sizes in the first and second directions, and (c) an aspect ratio of the second direction to the first direction. An inspection unit inspects whether the content includes a display area specification. A determination unit calculates a third size by multiplying the first size by the aspect ratio and determines a display area of the image frame based on an entire range in the first direction and a range of the third size from a predetermined position in the image frame in the second direction, when the display area specification is not included in the content. A controller performs control so that the display area of the image frame is displayed and a part other than the display area is not displayed.