A turbo decoder is used in a method for blockwise decoding a data signal that is error protection coded at a transmitter and that is detected in a receiver. The recording medium includes a write area and an escape area. To-be-verified biometric feature data is transmitted from first transceiving interface of data processing device to portable electronic device. On request of a palmtop computer, a robot program correlates the personal information fields with the frames of the Web page and sends the personal information back to the palmtop computer. The drift diffusion region includes a substrate inner region, and a surface region containing an impurity of the first conductivity type at a higher concentration than that of the substrate inner region.