An entertainment device and its operation method in which multiple operations are achieved by the same operation unit. The entertainment device has a main system that receives a supply of power from a power circuit, a push switch that receives operation instructions from outside, a system controller that receives signals from the push switch and controls the state of main system. An internal switch of the device decides whether to turn the power of main system on or off. When the power source of main system is turned on, the system controller decides, based on the state of signals received from the push switch within a first standard time, whether to output to internal switch a signal giving power off instruction, or whether to output to the main system a signal giving a reset instruction.