A terminal apparatus is constituted by an added data input section, a writing start/completion detecting section, an input position detecting section, a connected terminal selecting section, a specific terminal information input section, an added data storing section, a specific terminal information storing section, a specific terminal judging section, a display section, a transmitting terminal identification information adding section, a transmitting terminal information storing section, a transmitting terminal judging section, a data transmitting section, a data receiving section, a memory section(not shown), and a section(not shown) for inputting and measuring date information. This arrangement allows an information processing apparatus, which sends and receives data to and from a plurality of information processing apparatuses via a communicating means and includes a common board for a plurality of information processings, to improve ability to recognize data.