Abstract: There is provided a method comprising: allocating each user participating in a multi-user call to a first group, a second group, or a third group in dependence on a respective first priority associated with each user; causing a display to render image data representative of respective users in the first group in a primary area of the display and to render image data representative of respective users in the second group in a secondary area of the display, wherein users in a third group do not have image data rendered in either of the primary and secondary areas; and re-allocating each user participating in the multi-user call to the first group, the second group, or the third group in dependence on a respective second priority associated with each user, such that users immediately previously allocated to the third group are not re-allocated to the first group.