Method and device for managing content, storage medium; and adaptive content playing method using the same

A content management device comprising:

• a communication module which transmits content to a device connected over a network;
• an additional information edit processing unit which generates additional information comprising original content location information of the content and elapsed playing time information of the content, and inserts the additional information into the content;
• and
• a storage unit which stores the content into which the additional information has been inserted.

An adaptive content playing method comprising:

• inserting additional information into stored content which has been transmitted from a content provider device over a predetermined network, the additional information comprising original content location information of the stored content and elapsed playing time information of the stored content;
• detecting an original content provider device and an original content storage location using the original content location information comprised in the additional information;
• and
• playing original content from a point corresponding to the elapsed playing time information comprised in the additional information after changing a device to play the original content.