[0556] In the present embodiment, in the portable mode, the operation of the cooling fan 96 is limited. Specifically, in the portable mode, the rotations per minute (rpm) at which the cooling fan 96 is allowed to operate (in other words, the fan speed) is limited to be lower than the highest rpm at which the cooling fan 96 is allowed to operate in the console mode. For example, in the portable mode, the cooling fan 96 is controlled to operate at a predetermined rpm or less, which is lower than the maximum rpm.
[0557] With the limitation (b) above, it is possible to reduce the operation noise of the cooling fan 96. In the portable mode, it is assumed that a user uses the main unit 2 close to the user. In view of this, in the present embodiment, since the operation noise of the cooling fan 96 can be reduced in the portable mode, it is possible to reduce the possibility that the user may feel the operation noise is too loud.
[0558] On the other hand, the console mode is a mode in which the information processing device 1 is used as a console-type device. In the console mode, images obtained or produced by the information processing device 1 are displayed on the TV 6. The sound obtained or produced by the information processing device 1 is output from the speaker of the TV 6. In the console mode, the function suppressions in the portable mode are lifted. That is, in the console mode, the limitations (a) and (b) described above are lifted. Therefore, in the console mode, a program running on the information processing device 1 can make better use of the processing power of the CPU 81. The information processing device 1 can display, on the TV 6, images of a higher resolution than in the portable mode. The information processing device 1 can be cooled by the cooling fan 96 more effectively than in the portable mode.