Advertisement distribution server and advertisement distribution method

An advertisement distribution server which distributes advertisement information to a user terminal including an application program capable of displaying the advertisement information, the advertisement distribution server being connected to the user terminal through a communication network, the advertisement distribution server comprising:

• an advertisement information database to store the advertisement information;
• an advertisement distribution feasibility deciding unit to decide whether or not an advertisement is distributable to the user terminal, based on a user agent obtained from the user terminal or on user position information capable of specifying an access area of the user terminal, when the application program of the user terminal is activated;
• a distribution advertisement deciding unit to decide the advertisement information to be distributed from the advertisement information database to the user terminal, based on a predetermined condition, in a case where the advertisement is decided to be distributable by the advertisement distribution feasibility deciding unit;
• and
• a distributing unit to distribute the advertisement information to the user terminal, in a case where the advertisement information to be distributed is decided by the distribution advertisement deciding unit, wherein
• the advertisement distribution feasibility deciding unit includes:
• a carrier specifying unit to obtain the user agent from the user terminal when the application program of the user terminal is activated, so as to specify a carrier of the user terminal;
• a first feasibility deciding unit to decide whether or not the advertisement is distributable, based on the carrier specified by the carrier specifying unit;
• an identifying unit to identify the access area of the user terminal, based on a global internet protocol (IP) address as the user position information, in a case where the user agent cannot be obtained or the carrier cannot be specified by the carrier specifying unit;
• and
• a second feasibility deciding unit to decide whether or not the advertisement is distributable, based on the access area identified by the identifying unit.