FIELD: product selection technologies.
SUBSTANCE: server system 100 controls selection of product through data transfer network 120, by means of a series of screens. Server system 100 processes user data from user input signals to determine whether user data are synchronized with at least one of a set of products. Server system 100 transfers the earliest one of screen signals, appropriate for such earliest one of screens in series, which has no synchronized data, if selected screen is next in the order of screens and if previous screens in order, prior to selected one, all have no synchronized data.
EFFECT: increased product selection efficiency.
3 cl, 13 dwg
