Client device, information processing method, and information processing system

A client device comprising:

• a control section which acquires content identification information designated by a user who uses the client device as selection information;
• a transmission section which transmits, to a server device, a content transmission request including user identification information for identifying the user and the selection information acquired by the control section, and which, when the server device holds information obtained by associating the user identification information with the selection information as user-specific registration information, causes the server device to execute transmission of content data identified by the selection information as a response to the content transmission request;
• and
• a reception section which receives the content data transmitted from the server device.

An information processing method, comprising the steps of:

• storing content data;
• acquiring content identification information for identifying the content data;
• transmitting, to a server device, a registration request including user identification information for identifying a user and the content identification information;
• and
• causing, when the server device holds the content data identified by the content identification information, the server device to hold information obtained by associating the user identification information with the content identification information as user-specific registration information.