A mobile advertisement providing system, comprising: a mobile terminal configured to include an information display button, and comprising a keyword extraction unit; the keyword extraction unit configured to be driven in the mobile terminal, to recognize and analyze content displayed on the mobile terminal, and to extract keyword information related to the content displayed on the mobile terminal by detecting and analyzing the content, the keyword extraction unit extracting a keyword for part of content displayed on a display screen of the mobile terminal, and, when part of content displayed on the display screen of the mobile terminal changes, extracting a keyword for the changed part of the content, or extracting a keyword by analyzing content extracted via a keyword entered into a search box of the mobile terminal by the user; a keyword transmission unit configured to transmit the keyword information, extracted by the keyword extraction unit, to an information search relay server; an information reception unit configured to request keyword-related information from the information search relay server in response to pressing of the information display button, and to receive the keyword-related information from the information search relay server; an information output unit configured to output the keyword-related information, received by the information reception unit, onto the display screen of the mobile terminal; and an information management unit configured to manage the information output by the information output unit, wherein the information output by the information output unit is advertisement information or shopping information, and the information display button includes an advertisement display button or a shopping display button, wherein the information display button comprises a software information display button, a separate display or physical button disposed on a side or top surface of the mobile terminal, wherein the information output unit is further configured to output a navigation region configured to enable a user to select one or more of an advertisement, a shopping item, a search engine, a specific shopping mall, a social network service, and a messenger function when the information display button is pressed, wherein the outputting the keyword-related information is performed by the mobile advertisement providing system in which a content provider that provides the content displayed on the mobile terminal does not participate; and wherein the information output by the information output unit further comprise a link for registration of an advertisement or a product. a mobile terminal configured to include an information display button, and comprising a keyword extraction unit; the keyword extraction unit configured to be driven in the mobile terminal, to recognize and analyze content displayed on the mobile terminal, and to extract keyword information related to the content displayed on the mobile terminal by detecting and analyzing the content, the keyword extraction unit extracting a keyword for part of content displayed on a display screen of the mobile terminal, and, when part of content displayed on the display screen of the mobile terminal changes, extracting a keyword for the changed part of the content, or extracting a keyword by analyzing content extracted via a keyword entered into a search box of the mobile terminal by the user; a keyword transmission unit configured to transmit the keyword information, extracted by the keyword extraction unit, to an information search relay server; an information reception unit configured to request keyword-related information from the information search relay server in response to pressing of the information display button, and to receive the keyword-related information from the information search relay server; an information output unit configured to output the keyword-related information, received by the information reception unit, onto the display screen of the mobile terminal; and an information management unit configured to manage the information output by the information output unit, wherein the information output by the information output unit is advertisement information or shopping information, and the information display button includes an advertisement display button or a shopping display button, wherein the information display button comprises a software information display button, a separate display or physical button disposed on a side or top surface of the mobile terminal, wherein the information output unit is further configured to output a navigation region configured to enable a user to select one or more of an advertisement, a shopping item, a search engine, a specific shopping mall, a social network service, and a messenger function when the information display button is pressed, wherein the outputting the keyword-related information is performed by the mobile advertisement providing system in which a content provider that provides the content displayed on the mobile terminal does not participate; and wherein the information output by the information output unit further comprise a link for registration of an advertisement or a product.