An electronic device includes a power supply unit, a to-be-used function setting unit, and a function-specific power supply control unit. The power supply unit supplies electric power to a constituent unit of the electronic device from a main power source. The to-be-used function setting unit sets functions to be used when the main power source is turned on. The function-specific power supply control unit controls the power supply unit to a) supply electric power to a constituent unit corresponding to a function that has been set by the to-be-used function setting unit when the main power source is turned on and b) supply electric power to a constituent unit corresponding to a function that has not been set by the to-be-used function setting unit when the function that has not been set is selected after turning on the main power source.