1. A handheld data input apparatus comprising: a pressure-sensitive tablet; a character recognition means for recognizing handwritten character data input through said tablet; a document memory, connected to said character recognition means, for storing a recognition result from said character recognition means; a power supply for supplying power to said tablet, said character recognition means, and said document memory; and a casing integrally incorporated said tablet, said character recognition means, said document memory, and said power supply; and wherein said handheld data input apparatus is arranged to be connected to a document data processing apparatus main body via an external interface means, and when said handheld data input apparatus is connected to said document data processing apparatus main body, said character recognition means can supply document data from said document memory to said document data processing apparatus main body.
10. An apparatus according to claim 1, wherein said power supply is a rechargeable direct current power supply.