An information processing apparatus connects a plural coordinate input apparatus to a common screen display apparatus. The common screen display apparatus displays a common screen shared by a plurality of users. The plural coordinate input apparatus detects coordinate values instructed by a plurality of coordinate pointers and generates plural coordinate data. An input allocating section determines either supplying the coordinate data to an application or acquiring control authority and issuing an event to an operating system, based on the coordinate data entered from the coordinate input apparatus and position and back-and-forth relationship of windows of a plurality of applications displayed on the display apparatus.