A Self Organizing Network, SON, control system for performing SON control on a mobile communication system, the SON control being control based on a SON, the SON control system comprising: a Centralized-SON, C-SON, apparatus for covering base stations from a plurality of vendors and for performing a process for the SON control on the base stations that are covered; a Distributed-SON, D-SON, apparatus for covering one or more base stations from one vendor, for performing the process for the SON control on the base stations that are covered, and for performing a process including a C-SON process, the C-SON process including sending a report to the C-SON apparatus and a process instructed by the C-SON apparatus; and load control means for obtaining D-SON apparatus information including at least a load state of the D-SON apparatus from the D-SON apparatus and for adjusting, based on the obtained D-SON apparatus information, a timing for instructing the D-SON apparatus to execute the C-SON process so that a load on the D-SON apparatus is not concentrated on a time axis; wherein the load state of the D-SON apparatus includes the number of processes remaining in the queue of the D-SON apparatus; and wherein the load control means is configured to: hold, for every number of processes remaining in the queue of the D-SON apparatus, an average time until the number of processes remaining in the queue of the D-SON apparatus becomes a number that enables the D-SON apparatus to execute the C-SON process; and set, when it is evaluated that the timing for instructing the D-SON apparatus to execute the C-SON process should be moved to a later time, the timing for instructing the D-SON apparatus to execute the C-SON process based on the average time that corresponds to the current number of processes remaining in the queue of the D-SON apparatus. a Centralized-SON, C-SON, apparatus for covering base stations from a plurality of vendors and for performing a process for the SON control on the base stations that are covered; a Distributed-SON, D-SON, apparatus for covering one or more base stations from one vendor, for performing the process for the SON control on the base stations that are covered, and for performing a process including a C-SON process, the C-SON process including sending a report to the C-SON apparatus and a process instructed by the C-SON apparatus; and load control means for obtaining D-SON apparatus information including at least a load state of the D-SON apparatus from the D-SON apparatus and for adjusting, based on the obtained D-SON apparatus information, a timing for instructing the D-SON apparatus to execute the C-SON process so that a load on the D-SON apparatus is not concentrated on a time axis; wherein the load state of the D-SON apparatus includes the number of processes remaining in the queue of the D-SON apparatus; and wherein the load control means is configured to: hold, for every number of processes remaining in the queue of the D-SON apparatus, an average time until the number of processes remaining in the queue of the D-SON apparatus becomes a number that enables the D-SON apparatus to execute the C-SON process; and set, when it is evaluated that the timing for instructing the D-SON apparatus to execute the C-SON process should be moved to a later time, the timing for instructing the D-SON apparatus to execute the C-SON process based on the average time that corresponds to the current number of processes remaining in the queue of the D-SON apparatus. hold, for every number of processes remaining in the queue of the D-SON apparatus, an average time until the number of processes remaining in the queue of the D-SON apparatus becomes a number that enables the D-SON apparatus to execute the C-SON process; and set, when it is evaluated that the timing for instructing the D-SON apparatus to execute the C-SON process should be moved to a later time, the timing for instructing the D-SON apparatus to execute the C-SON process based on the average time that corresponds to the current number of processes remaining in the queue of the D-SON apparatus.