A method for controlling a display apparatus includes acquiring a plurality of first images from a plurality of first terminals, displaying the plurality of first images on a first screen via a display device, storing a maximum number of first images to be placed on the first screen in a storage circuit, in response to a signal transmitted from a second terminal that supplies a second image and requesting display of the second image, permitting the second terminal to display a second screen containing only the second image via the display device when the number of first images on the first screen is equal to the maximum number, and in response to the signal transmitted from the second terminal, permitting the second terminal to place the second image on the first screen when the number of first images being placed on the first screen is smaller than the maximum number.