Image sharing promoting apparatus, image sharing promoting method, and program

An image sharing promoting apparatus for promoting sharing of an image owned by a first user, from a first user terminal of the first user who is a member of a first social networking service and a second social networking service, to a second user terminal of a second user who is another member of the first social networking service and the second social networking service, the second user cooperating with the first user on the first social networking service and the second social networking service, the apparatus comprising:

• an information acquiring unit that acquires information to be transmitted and received between the first user terminal and the second user terminal;
• an image extracting unit that extracts one or more images related to the acquired information from an image group owned by the first user;
• and
• a presenting unit that performs a presentation for promoting sharing of the extracted one or more images with the second user, at the first user terminal,
• wherein the image extracting unit gives a weight to each of one or more images related to the acquired information, based on the number of members with which the second user cooperates in each of the first social networking service and the second social networking service, and extracts one or more images to be shared with the second user, from the image group owned by the first user, based on the weight given to each of one or more images related to the acquired information.