In an electronic shopping mall system (1), a receiving unit (1302) receives a content containing a higher-precedence material sent by a sending unit (1301). A display controller (1303) displays the content received by the receiving unit (1302) on a screen. The display controller (1303) displays, in response to an occurrence of an event, a pop-up on the screen in a manner superimposed on the content. In addition, when the higher-precedence material displayed on the screen is hidden by the pop-up, the display controller (1303) disposes an alternative material within the pop-up, and displays the alternative material on the screen. An executing unit (1305) executes a process associated with the higher-precedence material or the alternative material.