Method for proposing landmark

1. A method for proposing landmarks, comprising:

extracting landmarks in a country or area from digital images photographed in the country or the area;

clustering the extract landmarks to produce clustered landmarks, comprising:

analyzing the extracted landmarks for a weight of each item of a profile of the digital images;

prioritizing landmarks based on the weight of each item of the profile of the digital images,

wherein the items of digital images comprises at least one of a home address of a person who took the digital images, a season in which the digital images were taken, or a time of day in which the digital image were taken; and

proposing landmarks from the clustered landmarks to a user planning a trip based on items in a profile of the user,

wherein the items in the profile of the user comprise at least one of a user home address, a season in which the trip is scheduled, or a time of day in which the trip is scheduled.

2. The method according to claim 1 , wherein extracting landmarks in a country or area comprises:

dividing the country or the area into sectors having a predetermined size; and

performing landmark scoring based on the frequency of the extracted digital images for each sector.

3. The method according to claim 2 , wherein landmark scoring is performed based on the product of a factor corresponding to a ratio of digital images photographed in each sector to total digital images and a factor corresponding to a ratio of users having visited the sector to total users.

4. The method according to claim 1 , wherein analyzing the extracted landmarks for the weight of each item of the profile of the digital image comprises:

randomly dividing the landmarks derived from the digital images into two groups to measure similarity of the user profiles of the groups; and

prioritizing the items of the user profile based on the similarity.

5. The method according to claim 1 , wherein prioritizing landmarks based on the weight of each item of the profile of the digital image is performed based on a landmark score vector according to the profile of the digital image.

6. The method according to claim 5 , wherein the landmark score vector is derived by multiplication of a landmark score function according to the home address of the person who took the digital images, a landmark score function according to the season in which the digital images were taken, and a landmark score function according to the time of day in which the digital image were taken with a weight vector of the profile of the digital image.

7. The method according to claim 1 , wherein clustering the extracted landmarks to produce clustered landmarks comprises:

adding an empty set to a cluster value, and sorting a list of scored landmark data;

determining whether, from the uppermost data, the j th landmark data belong to a specific cluster; and

extracting the i th landmark data and, if similarity between the i th landmark data and the j th landmark data with respect to the profile of the digital image is higher than or equal to a predetermined threshold value, putting the i th and j th landmark data values into the cluster value.

8. The method according to claim 7 , wherein, if the j th landmark data belong to a specific cluster, whether the j+l th landmark data belong to the specific cluster is determined.

9. The method according to claim 1 , wherein the digital images comprise geo-tags containing information, such as a place and time at which the digital images were photographed, and a server associated with SNS is built as a database to extract the digital images.