An imaging control system comprising: a control device provided with: an acquisition means for acquiring information regarding a situation of a range captured by an imaging device (20,21); a determination means for determining a mode according to an assumed situation of the range captured by the imaging device among a plurality of focusing modes; and a transmission means for transmitting designation information specifying the determined mode to the imaging device; and the imaging device that receives the designation information from the control device and captures an image using the mode specified by the received designation information, wherein the determination means determines, in a case where the assumed situation is a situation in which an object is assumed to move in a constant direction, a first mode of continuously executing autofocus as the mode used by the imaging device, and determines, in a case where the assumed situation is a situation in which the object is assumed to stay in a constant position, a second mode in which frequency of autofocus is lower than the frequency in the first mode as the mode used by the imaging device, wherein the determination means determines the mode used by the imaging device based at least on information on time when the imaging device captures an image, and wherein the control device is further provided with a storage means for storing a table for associating a pair of place and time with the mode, the acquisition means acquires the information on the place of the range captured by the imaging device and the information on the time when the imaging device (20, 21) captures an image, and the determination means specifies the mode associated with the pair of the place of the range captured by the imaging device (20, 21) and the time specified from the information acquired by the acquisition means, and determines the specified mode as the mode used by the imaging device (20, 21) in the table. an acquisition means for acquiring information regarding a situation of a range captured by an imaging device (20,21); a determination means for determining a mode according to an assumed situation of the range captured by the imaging device among a plurality of focusing modes; and a transmission means for transmitting designation information specifying the determined mode to the imaging device; and the imaging device that receives the designation information from the control device and captures an image using the mode specified by the received designation information, wherein the determination means determines, in a case where the assumed situation is a situation in which an object is assumed to move in a constant direction, a first mode of continuously executing autofocus as the mode used by the imaging device, and determines, in a case where the assumed situation is a situation in which the object is assumed to stay in a constant position, a second mode in which frequency of autofocus is lower than the frequency in the first mode as the mode used by the imaging device, wherein the determination means determines the mode used by the imaging device based at least on information on time when the imaging device captures an image, and wherein the control device is further provided with a storage means for storing a table for associating a pair of place and time with the mode, the acquisition means acquires the information on the place of the range captured by the imaging device and the information on the time when the imaging device (20, 21) captures an image, and the determination means specifies the mode associated with the pair of the place of the range captured by the imaging device (20, 21) and the time specified from the information acquired by the acquisition means, and determines the specified mode as the mode used by the imaging device (20, 21) in the table.