An input apparatus configured with a plurality of blocks (140a, 140b, 140c) connectable to each other and having distributed amongst them each of: a position acquisition unit provided with a mechanism to acquire a position in a three-dimensional space; a connecting part identification unit (104, 106) configured to acquire a position to which another block is connected; a sensor measurement acquisition unit (134, 138) configured to acquire a measurement of an embedded sensor; an inclination identification unit (136a, 136b) configured to acquire an inclination; an inter-block communication unit (142a, 142b, 142c, 146b, 146c) configured to transmit or receive a signal to or from another block (140a, 140b, 140c) via a connecting part; an information transmitting unit configured to transmit information acquired internally to an information processor as claimed in claim 5 that uses a signal from the input apparatus as an input value to perform information processing in accordance with the position, posture, and shape of the input apparatus; and a block not provided with the inter-block communication unit (130a, 130b, 130c, 130d), wherein only a first block provided with the information transmitting unit collectively transmits, to the information processor, pieces of information that have been acquired within the respective blocks (140a, 140b, 140c) and transmitted from another block (140b, 140c) directly or indirectly connected to the block, and wherein a block (126a, 126b, 126c, 126d) provided with the inter-block communication unit (130a, 130b, 130c, 130d) and connected to the other blocks via the block not provided with the inter-block communication unit (130a, 130b, 130c, 130d) transmits internally-acquired information directly or indirectly to another block provided with the information transmitting unit. a position acquisition unit provided with a mechanism to acquire a position in a three-dimensional space; a connecting part identification unit (104, 106) configured to acquire a position to which another block is connected; a sensor measurement acquisition unit (134, 138) configured to acquire a measurement of an embedded sensor; an inclination identification unit (136a, 136b) configured to acquire an inclination; an inter-block communication unit (142a, 142b, 142c, 146b, 146c) configured to transmit or receive a signal to or from another block (140a, 140b, 140c) via a connecting part; an information transmitting unit configured to transmit information acquired internally to an information processor as claimed in claim 5 that uses a signal from the input apparatus as an input value to perform information processing in accordance with the position, posture, and shape of the input apparatus; and a block not provided with the inter-block communication unit (130a, 130b, 130c, 130d), wherein only a first block provided with the information transmitting unit collectively transmits, to the information processor, pieces of information that have been acquired within the respective blocks (140a, 140b, 140c) and transmitted from another block (140b, 140c) directly or indirectly connected to the block, and wherein a block (126a, 126b, 126c, 126d) provided with the inter-block communication unit (130a, 130b, 130c, 130d) and connected to the other blocks via the block not provided with the inter-block communication unit (130a, 130b, 130c, 130d) transmits internally-acquired information directly or indirectly to another block provided with the information transmitting unit.