9. The image reading apparatus according to claim 5 , wherein the input acceptance unit does not accept the selection input and the operation control unit sets a document placed on the document table as the current read object, when postures of the document feed unit are detected in the sequence of the second posture followed by the first posture by the posture detection unit, in a state where detection is made by the document presence/absence detection unit that a document is placed on the document placement section of the document feed unit, within a predetermined period of time after the operation of respective units including the document reading unit has been controlled in the first control mode by the operation control unit.
9. The image reading apparatus according to claim 5 , wherein the input acceptance unit does not accept the selection input and the operation control unit sets a document placed on the document table as the current read object, when postures of the document feed unit are detected in the sequence of the second posture followed by the first posture by the posture detection unit, in a state where detection is made by the document presence/absence detection unit that a document is placed on the document placement section of the document feed unit, within a predetermined period of time after the operation of respective units including the document reading unit has been controlled in the first control mode by the operation control unit. 10. The image reading apparatus according to claim 9 , wherein the selection input sets either a document placed on the document table or a document placed on the document placement section of the document feed unit as the read object document.