Content delivery system and method

A content delivery system comprising:

• a content delivery server:
• and a content delivery client, wherein the content delivery client comprises;
• first wireless communication circuitry that performs first wireless communication;
• second wireless communication circuitry that performs second wireless communication;
• and
• a first storage,
• the content delivery server comprises:
• third wireless communication circuitry that performs the first wireless communication;
• fourth wireless communication circuitry that performs the second wireless communication;
• and
• a second storage having a larger capacity than a capacity of the first storage,
• the content delivery client transmits control information about download of first content to the content delivery server through the first wireless communication circuitry,
• the content delivery client detects an area of the second wireless communication using the second wireless communication circuitry,
• when free space of the first storage is smaller than a volume of the first content, the content delivery client uploads second content stored in the first storage to the content delivery server through the second wireless communication circuitry and then downloads the first content,
• the content delivery server receives the control information on the download of the first content from the content delivery client through the third wireless communication circuitry,
• the content delivery server detects the area of the second wireless communication using the fourth wireless communication circuitry, and
• when the second content is uploaded from the content delivery client, the content delivery server temporarily stores the second content in the second storage and then downloads the first content to the content delivery client through the fourth wireless communication circuitry.