To provide an information processor, information server, information processing system, information processing method, and a program therefor which realize provision of services in accordance with a skin of an application which a user is using.

An e-mail software processing part 33 displays an interface screen provided by the e-mail software. A skin processing part 34 manages a skin (background design) in the interface screen being displayed by the e-mail software processing part 33. A skin information transmission processing part 35 transmits skin information to be information on the skin (background design) being managed by the skin processing part 34 to an information server 15. A transmission receiving processing part 32 receives from the information server 15 contents in accordance with the skin information transmitted by the skin information transmission processing part 35.