Patent ID: 7336179

Claim:
An interrogator having a specific interrogatory signal transmitter for transmitting a specific interrogatory signal including at least one set of positional information of plural sets of positional information contained in sets of information respectively transmitted from plural IC tags attached to a given page of a book according to positional information which indicates the given page and which is contained in said transmitted information, wherein when said sets of positional information respectively transmitted from the IC tags given positional information indicating that the page is the first page of the book, said specific interrogatory signal transmitter transmits the specific interrogatory signal including positional information indicating a highest page number out of page numbers indicated by the transmitted sets of positional information, and wherein when said sets of positional information respectively transmitted from the IC tags contain positional information indicating that the page is the last page of the book, the signal transmitter transmits the specific interrogatory signal containing positional information indicating a lowest page number of the page numbers indicated by the transmitted sets of positional information.