unit which requested acquisition first is allowed use of the display area a display processing supervisory means 22 judges whether each display processing by each processing unit r 1 rn is for a display area where use of each display processing is allowed if the display processing is for a display area where use is not allowed the display processing is not accepted in the first embodiment one task corresponds to one processing unit in the second embodiment however the case where one processing unit r 1 includes a plurality of tasks t 11 t 1 m will be explained for example a program schedule application as a processing unit includes three tasks that is 1 task 1 which sends operation input from an operation input section 40 to task 2 or task 3 depending on the situation 2 task 2 which displays the program schedule on screen and 3 task 3 which displays the details of the program on screen a display area acquisition request is sent from each processing unit r 1 rn and use is allowed for each processing unit r 1 rn an acquisition request may be sent from each processing unit r 1 rn independently or be sent from a specific task of each processing unit r 1 rn as a representative of the processing unit the latter case will be explained below the case when the display control device 2 in fig1 is applied to a digital broadcasting receiver will be explained the hardware configuration is the same as in fig3 in the rom 16 however coexistence relationship information is also.