The present invention provides an image taking main unit that prevents entry of foreign matter and has excellent usability even when an image taking lens unit is not attached thereto. Memory storing edge information and a posteriori probability information associated with a structured parity check matrix used to generate Low Density Parity Check coded signal are accessed. The terminal is comprised in a personal computing device. A temperature control unit 400 controls the temperature of the substrate to be processed by controlling the temperature adjustment by the temperature control unit 400 based on a measured temperature measured by the temperature measuring apparatus 200. The graphics display processor is operable to generate a representation of the other ink data with respect to the representation of the first ink data according to a common reference. The latter feature enables users to generate or review media when either disconnected from the network or network conditions are poor and to optimize the delivery of media over the network based on network conditions and the intention of the users participating in conversations.