Video server and method for managing activity log

A video server comprising:

• a plurality of processing modules each comprising a Central Processing Unit (CPU) configured to control an operation, to create an activity log based on a control condition of the operation, and to output the created activity log as an activity log file;
• and
• a maintenance/management module configured to manage the activity log file output from each of the plurality of processing modules,
• the maintenance/management module comprising:
• a storing medium configured to record the activity log file;
• and
• a maintenance/management controller configured to determine whether the storing medium has a free region for recording the activity log file, to write the activity log file in the storing medium when the storing medium has the free region, and, when the storing medium has no free region, to delete an oldest activity log file recorded in the storing medium to form a free region and to write the activity log file in the formed free region.