1. A label creation system comprising: a tape printing unit which prints a reference mark as an indicator of unit length onto a tape and thus creates a reference label; an image pickup unit which picks up an image of the reference label arranged along a pasting surface forming a planned pasting area where a fixed-length label having a predetermined label length is pasted, together with the planned pasting area; an image processing unit having a dimension detection unit which, by image processing, compares the reference mark printed on the reference label and the planned pasting area in a picked-up image and detects a length dimension of the planned pasting area that is in a direction of length of the fixed-length label; and a label length setting unit which sets a label length of the fixed-length label based on the length dimension of the planned pasting area that is detected; wherein the tape printing unit prints on the tape and creates the fixed-length label, based on the label length of the fixed-length label that is set.