An apparatus for managing the storage of image data captured by a plurality of image capturing means is provided. The apparatus comprises designation means configured to receive a designation of the importance of at least one of the plurality of image capturing means; first storage means configured to store the captured image data; determining means configured to determine the availability of a second storage means to which image data stored on the first storage means is to be transferred, and to determine the available storage space of the first storage means; image data control means configured to transmit a control command to at least one of the plurality of capturing means and first storage means; and in the case that it is determined that the second storage means is unavailable, and the available storage space of the first storage means is determined to be less than a predetermined threshold, the image data control means is configured to transmit the control command to the at least one of the plurality of image capturing means and the first storage means to control the respective means so as to reduce the amount of captured image data stored on the first storage means in accordance with the designation of the importance of the at least one of the plurality of image capturing means.