A face recognition apparatus, comprising: an image input unit configured to input images captured by a camera at a first frame rate or a second frame rate higher than the first frame rate, the first frame rate having a first time interval at which images are input, the second frame rate having a second time interval at which images are input, the first time interval being larger than the second time interval; a face recognition unit configured to recognize the face of a person contained in the input images; and a control unit configured to change a time interval at which images are input, from the first time interval of the first frame rate to the second time interval of the second frame rate, if a specific condition on the tracking of the face recognized from the images input at the first frame rate is met; characterized in that the control unit is configured to determine that the specific condition is met if it is determined a first condition that the recognized faces of more than two persons contained in the same image input at the first frame rate are within a given distance; and the face recognition apparatus further comprises: a face tracking unit configured to track, if the recognized face is identical to a recognized face contained in the images input thereafter; and a front face determination unit configured to determine whether or not the recognized face is photographed from the front side of a person, wherein the control unit further determines that the specific condition is met if the front face determination unit determines a second condition that the recognized face is not photographed from the front side of a person, the control unit being configured to change the time interval at which images are input from the first frame rate to the second frame rate only if both the first condition and the second condition are met. an image input unit configured to input images captured by a camera at a first frame rate or a second frame rate higher than the first frame rate, the first frame rate having a first time interval at which images are input, the second frame rate having a second time interval at which images are input, the first time interval being larger than the second time interval; a face recognition unit configured to recognize the face of a person contained in the input images; and a control unit configured to change a time interval at which images are input, from the first time interval of the first frame rate to the second time interval of the second frame rate, if a specific condition on the tracking of the face recognized from the images input at the first frame rate is met; characterized in that the control unit is configured to determine that the specific condition is met if it is determined a first condition that the recognized faces of more than two persons contained in the same image input at the first frame rate are within a given distance; and a face tracking unit configured to track, if the recognized face is identical to a recognized face contained in the images input thereafter; and a front face determination unit configured to determine whether or not the recognized face is photographed from the front side of a person, wherein the control unit further determines that the specific condition is met if the front face determination unit determines a second condition that the recognized face is not photographed from the front side of a person, the control unit being configured to change the time interval at which images are input from the first frame rate to the second frame rate only if both the first condition and the second condition are met.