An apparatus comprising: a detection unit configured to detect a state of an electric lock provided at a doorway; a first monitoring camera arranged on the inside of the doorway; and a first storage unit configured to store a lock history of the electric lock , by storing each time of day when the electric lock is locked; characterized in that the apparatus further comprises: a setting unit configured to set a reference time of day based on the lock history by detecting the final locking time of day in each of a plurality of days and setting the reference time of day as a representative value thereof, preferably as one of a mean value, a mode value, or a median value of the final locking times of the plurality of days, or as the latest time of day or the earliest time of day among the final locking times of day of the plurality of days; a judging unit configured to judge, at the reference time of day set by the setting unit, whether the electric lock is locked; and a sending unit configured to send image data captured by the first monitoring camera or location information of the image data in an image storage unit of the apparatus or a file server to a destination corresponding to the electric lock , when the electric lock is not locked at the reference time of day. a detection unit configured to detect a state of an electric lock provided at a doorway; a first monitoring camera arranged on the inside of the doorway; and a first storage unit configured to store a lock history of the electric lock , by storing each time of day when the electric lock is locked; characterized in that the apparatus further comprises: a setting unit configured to set a reference time of day based on the lock history by detecting the final locking time of day in each of a plurality of days and setting the reference time of day as a representative value thereof, preferably as one of a mean value, a mode value, or a median value of the final locking times of the plurality of days, or as the latest time of day or the earliest time of day among the final locking times of day of the plurality of days; a judging unit configured to judge, at the reference time of day set by the setting unit, whether the electric lock is locked; and a sending unit configured to send image data captured by the first monitoring camera or location information of the image data in an image storage unit of the apparatus or a file server to a destination corresponding to the electric lock , when the electric lock is not locked at the reference time of day. a setting unit configured to set a reference time of day based on the lock history by detecting the final locking time of day in each of a plurality of days and setting the reference time of day as a representative value thereof, preferably as one of a mean value, a mode value, or a median value of the final locking times of the plurality of days, or as the latest time of day or the earliest time of day among the final locking times of day of the plurality of days; a judging unit configured to judge, at the reference time of day set by the setting unit, whether the electric lock is locked; and a sending unit configured to send image data captured by the first monitoring camera or location information of the image data in an image storage unit of the apparatus or a file server to a destination corresponding to the electric lock , when the electric lock is not locked at the reference time of day. <EOS>