An electronic apparatus includes a first terminal that receives power supplied from an external apparatus, a second terminal that is used to determine a power supply capability of an external apparatus, an internal circuit that includes a communication control unit that communicates with an external apparatus via the second terminal, a capacitor that forms an AC coupling between the internal circuit and the second terminal, a route that bypasses the capacitor, a switch that causes the route to switch to a conductive state or a non-conductive state, and a control unit that controls the switch by determining whether a first voltage applied to the first terminal by the external apparatus exceeds a second voltage which can be applied to the internal circuit via the second terminal.