Abstract: A technology for distributing a content to wireless portable terminals through P2P by using a short-haul radio scheme. A wireless terminal detects another wireless terminal capable of communicating with the first wireless terminal, receives a content, receives control information on the content, and carries out control according to the control information. The present invention wherein communication reflects the intention of the content providing side since wireless terminals perform communication according to the control information, a content distributing method, a wireless terminal, a content distribution program, and a content distribution system are disclosed.

Abstract: A technology for distributing a content to wireless portable terminals through P2P by using a short-haul radio scheme. A wireless terminal detects another wireless terminal capable of communicating with the first wireless terminal, receives a content, receives control information on the content, and carries out control according to the control information. The present invention wherein communication reflects the intention of the content providing side since wireless terminals perform communication according to the control information, a content distributing method, a wireless terminal, a content distribution program, and a content distribution system are disclosed.

Abstract: A comparison between a cost required when retrieval is performed after an index corresponding to a retrieval condition is generated and a cost required when entire retrieval is performed is made. If the cost required when the entire retrieval is performed is higher, it is determined whether or not an applicable index exists among already generated indexes. If an applicable index does not exist, an index corresponding to the retrieval condition is generated. A database is then retrieved by using the generated index.