1. An image processing apparatus, comprising: a switch section to be operated to start supply of an external voltage; a power supply section using the external voltage to generate a power supply voltage and supply the generated power supply voltage; an operation display section using the power supply voltage to perform an operation; an image processing section using the power supply voltage to perform a specific image processing; an initialization control section for causing the operation display section to start a predetermined first initialization processing when the power supply section starts to supply the power supply voltage in response to the operation of the switch section by a user, and causing the image processing section to start a predetermined second initialization processing after the start of the first initialization processing; and a condition receiving section for accepting an input of an execution condition for use in the image processing, wherein the operation display section includes a display part, a storage part, a display control part for causing the display part to display an operation screen allowing an input of the execution condition after completion of the first initialization processing, and a condition setting part for, when the execution condition is inputted via the operation screen during the second initialization processing, storing the execution condition in the storage part and outputting the execution condition stored in the storage part to the condition receiving section after completion of the second initialization processing.