Abstract: According to one embodiment, a video display apparatus including, a first power-supply module configured to be charged while a commercially available power is connected, a second power-supply module connected as an external apparatus and configured to be charged together with the first power-supply module while the commercially available power is connected, and a power switching module configured to supply power from at least one of the first and second power-supply modules upon receipt of an instruction to stop connection with the commercially available power.

Abstract: According to one embodiment, a video display apparatus including, a first power-supply module configured to be charged while a commercially available power is connected, a second power-supply module connected as an external apparatus and configured to be charged together with the first power-supply module while the commercially available power is connected, and a power switching module configured to supply power from at least one of the first and second power-supply modules upon receipt of an instruction to stop connection with the commercially available power.

Abstract: A communication apparatus, which communicates with a host unit based on polling method, includes a control receiving unit that receives a control information to be transferred to the host unit from a user terminal, a request receiving unit that receives a request from the host unit to transfer the control information to the host unit, and a transmitting unit that transfers the control information to the host unit as a response to the request, provided that the control receiving unit receives the control information after the request receiving unit receives the request.