An interface for designing a report is provided, with elements of the report being disposed at intersections of report positions and configured to present information derived from data in a database. Widths of the first and second patches in the predetermined direction and widths thereof in an intersectional direction intersecting the predetermined direction are greater than a spot size of the optical sensor. Finally, an Idle Acknowledgment is transmitted when an idle frame has been received with a sequence number equal to the sequence number of the next new data frame expected.