Abstract: A method and device for searching for a music file of a mobile terminal are provided. The method of searching for a music file of a mobile terminal includes, receiving at least one input key signal in an idle state of the mobile terminal, setting a search word by combining characters mapped to the received at least one input key signal, determining whether a music file that includes the search word exists within the mobile terminal, and requesting, if it is determined that a music file that includes the search word does not exist within the mobile terminal, a search for a music file that includes the search word to a preset web server.

Abstract: An advertisement providing method and system may allow improving the frequency of advertising exposure. In a method for providing an advertisement, a client sends a request message to a server. The request message requests an action of the server. The server determines whether an error occurs when performing the action. If the error occurs, the server extracts advertisement data based on information in the request message. The server creates a response message by combining the extracted advertisement data with error occurrence information, and sends the response message to the client.

Abstract: A method and device for searching for a music file of a mobile terminal are provided. The method of searching for a music file of a mobile terminal includes, receiving at least one input key signal in an idle state of the mobile terminal, setting a search word by combining characters mapped to the received at least one input key signal, determining whether a music file that includes the search word exists within the mobile terminal, and requesting, if it is determined that a music file that includes the search word does not exist within the mobile terminal, a search for a music file that includes the search word to a preset web server.