A control unit 15 is provided at an imaging system 10. The control unit 15 controls a mode relating to imaging of an imaging apparatus according to posture determination information indicating at least posture of the imaging apparatus in a separation state between a fixation state in which the imaging apparatus and an information processing apparatus are fixed to each other and the separation state in which the imaging apparatus is separated from the information processing apparatus. For example, when a fixation/separation determining unit 91 of the imaging apparatus 20 determines that the imaging apparatus 20 and the information processing apparatus 60 are in the separation state, a control unit 45 controls the mode relating to imaging of the imaging apparatus 20 according to the posture determination information indicating the posture of the imaging apparatus 20. When the fixation/separation determining unit 91 of the information processing apparatus 60 determines that the imaging apparatus 20 and the information processing apparatus 60 are in the separation state, a control unit 85 controls the mode relating to imaging of the imaging apparatus 20 according to the posture determination information indicating the posture of the imaging apparatus 20. It is possible to easily set the mode relating to imaging.