Electronic device

A portable telephone may include an AV processing block (200), a telephone processing block (300) and a common processing block (400). A power management controller (101) may control a power supply of each block, i.e. operation and non-operation. The power management controller (101) may have connected thereto a power supply key (K1) and a power supply decision key (K2). When depressing the key (K1) sequentially, the user can repeatedly select an AV mode, a PHONE mode and an AV/PHONE mode. A user can determine the selected mode by depressing the key (K2). In the area in which a use of an electronic device which may generate electromagnetic waves is prohibited, a user can use this portable telephone in the AV mode. Also, outside the telephone service area, a user can use this portable telephone in the AV mode, thereby making it possible to avoid an electric power from being uselessly consumed when the power supply of the telephone processing block (300) is held at ON state. Thus, the portable telephone of the present invention may become easier to handle.